B05910712 by IOSR JOURNAL OF ENGINEERING

IOSR Journal of Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 05, Issue 09 (September. 2015), ||V1|| PP 07-12

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The research of oil-water distribution in the eastern block of Chao202-2 area Liu Jiyu, Chen Haitao, Jin Xin，Sheng Caiwen 1（College of earth science of Northeast Petroleum University, Daqing, Hei Longjiang,China ） 2 (Second oil factory of Daqing oil field, Daqing, Hei Longjiang,China) 3 (Well logging technology service company, Daqing, Hei Longjiang,China) Abstract: - The eastern block of Chao202-2 area belongs to the channel sand body deposition，where the faults are well developed and complex combination. The oil, water and gas distribution is relatively complex and influences the injecting-producing relation, so the study of control factors is needed. According to the geological characteristics of the eastern block of Chao202-2 area, clear regional geological characteristics, logging identification technology as the core technology and logging identification technique for identifying oil and water layer, oil-water layer logging interpretation chart was established. With a combination of the oil-water layer interpretation results, the test resultsand the existing research results of regional geological features, the characteristics of the oil and water distribution in the block were induced and analyzed. In the study area, structural reservoir is the main reservoir type. Oil-water distribution is controlled by structural factors and space configuration of fault and sand body control the oil-water distribution border. From the fault analysis of the plane, oil-water distribution was determined. Keywords：oil-water distribution，fault，structure，channel sand body，logging interpretation

REGIONAL GEOLOGICAL BACKGROUND

The eastern block of Chao202-2 Area is located in the territory of Zhaozhou County, Daqing City, Heilongjiang Province, the alar part of Chaoyanggou oil field. The air permeability of the block is 5.2×10 -3μm2, the formation oil viscosity is 14.1mPa·s and the ground crude oil viscosity is bigger, which achieves 42.48mPa·s. The study area belongs to river-lake deposits, where the faults are well developed and complex combination. The results of structural history research show that the tectonic development of the inner block has the close relation with the structure of the songliao basin development and the formation of the depression. Roughly experience four stages: fault-depression stage (The Jurassic sedimentary period), rift-depression stage (Denglouku formation sedimentary period), downwarp stage（ the depositional period of Quantou group and Nenjiang group) and rising stage （After the deposition of the nenjiang formation). The Major reservoir is located in Fuyu oil layer which belongs to microfacies of the delta front. The main sand body type is subaqueous distributary channel,

whose distribution is mainly controlled by the southwest direction

sedimentary systems distributed from southwest to northeast direction. There is no obvious characteristics on oil and gas distribution in the study area. The average production of single oil well

has decreased year by year and

the average injection water of single water well has decreased after the production. production declines fast

The

and the development effect is poor. Therefore, to improve the development effect

and guide the core area evaluation of the similar blocks, we conduct a related study on the oil and water distribution characteristics in the block.

II.

THE RESEARCH ON OIL AND WATER LAYER IDENTIFICATION

Oil and water layer identification is a key link in the process of reservoir development. Either oil layer mistaken for water layer or water layer mistaken for oil layer will have adverse effect on calculation of reserves and oil field development produce. Different regions and horizons have different selected evaluation standards. The oil and water distribution in the study area is relatively complicated, so accurately determining oil and water layer identification and classification standard is of great significance [1]. Based on the characteristics of the oil reservoir in this area, the study of the "four sex of characters", and the logging theory, optimize deep lateral

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The research of oil-water distribution in the eastern block of Chao202-2 area resistivity curves which can obviously reflect the liquid property, and sonic time difference curves which can obviously reflect reservoir permeability as the standard for establishing logging parameters in the study area [2]. Combined with core and testing materials, apply the data of 52 layers from 8 coring wells including 10 oil layers , 21 poor oil layers, 16 dry layers and 5 water layer layers. Then, eliminate abnormal point. Finally, get oil and water layer interpretation and evaluation chart in the study area chart (figure 2.1).Chart accuracy can reach 87.5%, which meets the requirement of oil-water layers interpretation and evaluation in the study area. At the same time, the oil-water standards are determined as follows: Oil layer: Poor

LLD

oil

AC  220  s / m

Dry layer

  0 . 0543 AC  37 . 216

layer ：

AC  220  s / m

 0 . 0543 AC  37 . 216  R

LLD

;

  0 . 0438 AC  28 . 329

which

;

 0 . 0438 AC  28 . 329  R

Water layer：

,of which

LLD

  0 . 023 AC  17

  0 . 023 AC  17

,eliminate abnormal points;

;

in the formula: RLLD—deep lateral resistivity, Ω·m. AC—interval transit time，μs/m.

Figure2.1 Oil-water interpretation and evaluation chart in the eastern block of Chao202-2 area Applying oil-water interpretation and evaluation chart has explained 120 wells in the study area, which were divided into 152 oil layers, 289 poor oil layers, 220 dry layers, 78 water layers.

III.

OIL AND WATER DISTRIBUTION CHARACTERISTICS

3.1 The whole region of oil and water distribution The interpretation results projected to the scattered point, it can be seen that the whole region has no uniform oil-water interface (Figure 3.1).

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The research of oil-water distribution in the eastern block of Chao202-2 area

Figure 3.1 oil-water distribution map of the whole region Seen from the reservoir section of it, structure becomes low and sand body development gradually becomes poor from west to east (figure 3.2). Different fault blocks have different oil-water distribution characteristics, roughly divided into “up oil, bottom water”, “up water, bottom oil” and “water in oil”. Seen from the Figure 3.3, structure becomes low from north to south and the oil-water distribution characteristics of different fault blocks are very complex [3-4], which is the same as east-west profile. 10C 90-84 SP

10C 90-82 SP

地层

10C 90-86

RL3S

地层

RL3D 深度

RL3S

地层

RL3S

F111

F112

RL3D 深度

10C 90-80

横50向比例尺 100

150米

F113

地层

F114

F111

RL3S

F111 F115 F112

F112

F113

F113 F121 F114

F114

F115

F111 F112 F113 F114 F115

F115

F111 F122 F121 F121

F112

F113 F123 F114 F122 F122

F115 F131

F121

F122

F123

F131

F132

F133

F123 F123 F132

F131 F133 F131

F132 F14

F132 F133

F133

F151

10C 97-91

F14

SP F152

LLD 深度

地层

F151

LLS

F151

F153

F14

F14 F152 F152

F161

F151

F153

F152

F161

F153

F161

F162

F163

F171

F153

F111 F112 F113

F162 F161 F114

F163

F115

F162

west

F121 F171 F163 F163

F122

F172 F171

10C 98-92 SP

F171

RL3D 深度

F172

地层

F173

RL3S

F123

F172 F173 F211

F172

F131

10C 100-94

F173 F172 F111 F212

F132

F211

F112

F113

F173

F221

F211

F173

RL3D 深度

F133 F114

地层

RL3S

F222 F115

F212 F14

F211

F212

F211 F23

F121

F221 F151 F221 F111 F222

F212

F221

F241 F112 F222 F152 F113

F123 F242

F114

F23 F23

F115 F153

F222

F131

F222 F251 F241

F241

F23

F132

F121

F122

F123

F131

F132

F133

F252

F242

F112 F113 F114 F115

F121

east

F161

F23 F242

F162 F133 F253

F241

F111

F122

F251

F241

F251 F14

F242

F251

F252

F253

F312

F311

F321

F312

F311

F252

F163

F252 F151 F253 F171 F312 F253

F311 F152 F172 F311

F321

F153 F14

F322

F312

F173

F321

F211

F14

F161

F151

F152

F153

F161

F162

F163

F171

F172

F173

F211

F212

F221

F222

F331 F162

F322

F212

F332

F322

F333

F331

F163 F331

F321

F321 F221

F171 F332

F322

F331

F332

F333

F341

F342

F343

F351

F222 F332 F341

F333 F172 F333

F23

F341

F241

F342

F341

F173

F343

F242 F342

F342

F221 F251 F343 F343

F252

F222

F253

F23

F311

F241

F312 F242

F321

F251

F252

F322

F253

F311

F312

F23

F321

F241

F242

F251

F252

F253

F311

F312

F321

F322

F331

F332

F333

F341

F342

F343

F351

F322

F331

F332

F333

F341

F342

Oil layer Water layer Dry layer

F343

F351

F352

F353

F354

F355

Figure 3.2 East-west reservoir profile map in the eastern block of Chao202-2 area 10C94-84 SP

RL3D 深度

地层

RL3S

865 870

F111 875

F111 F112

F112

F113

F113 880

F114

F115

885

F114

10C98-82 SP

890

F121

RL3D 深度

F121

地层

RL3S

895

F122

900

F123

F123 F111

905

F112

F131

F131 F113 910

910

F132

F114

F115

F132

915

F121

F133

F133 920

920

F122

F14

925

F14

F123

930

F151

10C103-81 SP

F131

LLD 深度

地层

935

F152

LLS

F152

10C111-80

940

LLD 深度

F132

地层

F153

LLS

F153 945 945

945

F133

F161

F111 950

950

F112 F113

F14

F162

F114

F111

955 955

955

F115

F112

F151 F113

F163

F163 960 960

960

F114

F121 F115

F152

965 965

F171

965

F171

F121

F122 F153

970 970

970

F172

F123

F122

10C120-76

10C114-76 SP

RL3D 深度

F161 975

F173

RL3D 深度

地层

975

RL3S

地层

RL3S

F173 F131 980

980

F162

980

F211

985

F211

980

F123

980

F132 985 985

985

F131 F163 F111 F111 990

990

F133

F112

990

F212

990

F212

990

F113 F132

F113

F171 F114 995

F114 F14

995

F221

995

north

970

F172

F115

F221

F115

F111 F112 F113 F114 F115

1000

F133 F172 1000

1000

F121

F122

F123

F131

F132

F133

1005

F222 1005

1005

F14

1005

F121 F121

F151

F222

F173

F122

1010

F152 1010

1010

F23

F151

F23 F211 1015

1015

1020

F161

1015

F153

1015

F123

F152

F241

1020

F241

F212 1020

1020

F153 F131

F242 F162

1025

F221

F161

F132 1030

1030

F251

F162

F133

1035

F252

F14

F151

F152

F153

F161

F162

F163

F171

F172

F173

F211

F212

F221

F222

1035

F253

1035

F252

1030

F163

F222

F23 F171

F253

1040

F241 1045

1045

F172

F171

1045

F311

F151

1050

F242

1050

F312

1040

F14

F163

F311

F312

south

1025

F242

F172

F173

F152

1055

F251

F321

F211

F321

F153

F173

1060

F252

F161

1065

F212

F322

1065

F322

F211 1065

1065

F253

1070

F162

F221

1070

F331 1070

F331

F311

F212

F163

F312

F332

1080

F23

F171 1085

1085

F333

F222 1085

1085

F322

F241 1090

1090

F172

1090

F341 1090

F341

1080

F221

F321

F333

1075

F222

1075

F332

F23

F242 F331

1095

F342

1095

F342

F251 F173

F332 1100

1100

F241

F252 1100

1100

F343

F343 F253

F333

F211 1105

1105

F242

F311 1110

1110

F251 1110

1110

1115

F252

1115

F312

F212

1115

F221 1120

1120

F253

1120

F321

1125

F222

F311 1125

1125

F322

F23

F241

F242

F251

F252

F253

F311

F312

F321

F322

F331

F332

F333

1130

F312

F23

F331 1135

1135

F321 F241

1140

F332

1140

F322

F242

1145

F333 1145

1145

F251

1150

F331

1150

F341 F252

1155

F253

F332

F342

1160

F311 1160

1160

F333 F343 1165

1165

F312

F341 1170

1170

F351

1170

F321 1175

1175

F352 1175

1175

1180

1180 1185

1185

1185 1190 1195 1200 1205

Oil layer Water layer Dry layer

Figure 3.3 South-north reservoir profile map in the eastern block of Chao202-2 area

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The research of oil-water distribution in the eastern block of Chao202-2 area 3.2The controlling factors of oil-water distribution According to above analysis, the oil-water distribution is mainly controlled by two factors in the research blocks. 1. The fault structure has some influence on oil-water distribution. The faults are developed well in the study area. By the study of chemical and physical properties of oil, gas and water in the reservoir near both sides of faults, it shows that the oil, water and gas property has many differences near both sides of faults, which indicates that the fault in the study area has a certain sealing ability and can form a mutual non-nterference reservoir. Therefore, the fault block may have a complex oil-water distribution from vertical (horizontal) direction in both side of the fault [5-6]. 2. The sedimentary lithology has some influence on oil-water distribution. The sand body in the reservoir of the study area is preexisting sand body relative to the structure while the structure of the sand body is late structure relative to the sand body. The research area mainly develops channel sand body and point bar sand body. The river channel sand body is in dendritic distribution. The air permeability of the main channel is 6.1×10-3μm2, the air permeability of the non main channel is 4.8×10 -3μm2, and the reservoir permeability is lower. There is a large amount of argillaceous filling between river and river and the connectivity between sand body is poor, which ensures the independence of sand body between oil and water distribution characteristics [7-8] . 3.3 The characteristics of the oil-water distribution controlled by different blocks Based on the analysis of the above, the spatial configuration of fault and sand body controls the boundary of oil-water distribution. On the basis of controlling factors, the district can be divided into 10 blocks (figure 3.4). According to the characteristics of oil and water distribution, it is divided into three types.

Figure 3.4 oil-water distribution map of the whole region of blocks 1、The oil layer and water layer are developed at the same time within the same fault block. The characteristics of the oil-water distribution is “up oil, bottom water”. In fault block 4, for example, the structure of the fault block becomes low from north to south. Although the water well 135-46 is in the higher position than the oil wells in the south, due to the combination of fault and structure, the water well 135-46 located In different blocks compares with the well in the south. The characteristics of the oil-water distribution in the block is that the oil reservoir is in the north and the water reservoir is in the south. The regularities of distribution accord with oil-water distribution characteristics of structural reservoir (figure 3.5).

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The research of oil-water distribution in the eastern block of Chao202-2 area

Figure 3.5 oil-water distribution map of the F131 2、The oil layer and water layer are developed at the same time within the same fault block. The characteristics of the oil-water distribution is “up water, bottom oil”. In block 10, for example, with relatively higher position, the well 131-24 inside the fault belongs to the water layer, while other wells with relatively lower position belongs to oil layer. The main reason for forming this type is that sedimentary facies belts of the well 131-24 are different from the other three wells. Mudstone segment in the middle causes the different distribution of oil and water (figure 3.6).

Figure 3.6 oil-water distribution map of the F171 3. Within the same fault block, just the oil layer or water layer is developed. In block 8, for example, the well 133-65 inside the block belongs to the water layer and the same layer in adjacent block is oil layer. Although the characteristic of “ high water, low oil” can be seen in the oil and water distribution scatter plot, the water well and the oil well are divided by the fault which has a certain closed feature to make them form independent fault blocks. In the same oil layer, the wells of different fault blocks don’t disturb each other (figure 3.7).

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The research of oil-water distribution in the eastern block of Chao202-2 area

Figure 3.7 oil-water distribution map of the F171

IV.

CONCLUSION

1. In the study area, the main reservoir type is structural reservoir. Oil-water distribution is controlled by structural factors and the space configuration of fault and sand body controlled oil-water distribution border. 2. From the analysis of the plane, the oil-water distribution can be divided into three types: (1) Within the same block, oil and water layer are developed at the same time. Oil-water distribution is “up oil, bottom water”. (2) Within the same block, oil and water layer are developed at the same time. Oil-water distribution is “up water, bottom oil”. (3) Within the same fault block, the oil or water layer is only developed one.

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