基于微地震数据和嵌入式离散裂缝的页岩气开发渗流数值模拟

Abstract

Abstract:

Shale gas development is in an important position of natural gas development strategy for Sinopec, and numerical simulation technology is an important technical means to optimize the policy and scheme of development technology, predict the production performance of gas wells, study the production rule, and track and optimize the development of gas fields. The traditional numerical simulation method of shale gas development adopts equivalent medium model, can not depict the distribution of crack network after fracturing, and is unable to accurately predict the production of layered reserves, so that it can not meet the needs of the field. Therefore, a new method for shale gas simulation based on embedded fracture modeling is proposed. This method consists with four stages:①to establish geological structure model; ②to describe the fracture characteristics of the fracture network based on micro-seismic data, and then embed it in the geological model background grid and calculate the conductivity; ③to fit the production data and adjust the fracture parameters; ④to prediction and analyze the productivity and production of reservoir reserves for multi-stage fracturing horizontal wells. The proposed method has been applied to a three staged fracturing wells in Fuling shale gas reservoir and the utilization of the reserve in the well is analyzed. It provides technical support for the next adjustment scheme of the platform.

Key words: shale gas, numerical simulation, fracture modeling, microseismic data

CLC Number:

TE319

Cheng DAI,Xiaohu HU,Sidong FANG, et al. Numerical simulation for seepage of shale gas reservoir development based on microseismic data and embedded fracture modeling[J]. Reservoir Evaluation and Development, 2019, 9(5): 70-77.

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References 18

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小层	厚度/ m	孔隙度/ %	含气饱和度/ %	吸附气含量/（m³·t^-1）	储量/ 10⁸ m³
①	6.00	4.51	69.10	2.70	3.06
②	1.00	4.90	69.50	3.10	0.56
③	14.10	4.73	67.80	2.60	7.00
④	9.30	4.73	59.80	1.90	3.71
⑤	9.60	5.61	60.10	1.90	4.00

属性	取值
模型尺寸/m³	1 800×1 800×85
埋深/m	2 550
网格数	291 600
储层压力/MPa	38
储层温度/℃	85
Langmuire体积/（m³·t^-1）	2.1~3.6
Langmuire压力/MPa	6
地质储量/m³	18.3×10⁸
基质渗透率/10^-3 μm²	4.93×10^-5
水力裂缝导流能力/（10^-3 μm²·m）	9.87

井号	微裂缝导流能力/ （10^-3 μm²·m）	主裂缝导流能力/ （10^-3 μm²·m）	有效裂缝半长/ m
JYA-1HF	4.93	9.87	82 ~ 174
JYA-2HF	14.80	19.70	61 ~ 127
JYA-3HF	4.93	4.93	66 ~ 189

小层	JYA-1HF 动用面积/km²	JYA-2HF 动用面积/km²	JYA-3HF 动用面积/km²	剩余储量/10⁸ m³
1	0.31	0.26	0.26	2.72
2	0.31	0.25	0.26	0.51
3	0.29	0.25	0.26	6.33
4	0.27	0.23	0.24	3.39
5	0.25	0.20	0.23	3.68
平均动用面积	0.29	0.24	0.25
动用百分比/%	32.92	31.70	33.39

井号	加密前EUR/10⁸ m³	加密后EUR/10⁸ m³
JYA-1HF	1.40	1.36
JYA-2HF	1.18	1.16
JYA-3HF	1.14	0.98
JYA-4HF（加密）		0.91
JYA-5HF（加密）		0.97
合计	3.72	5.38

Numerical simulation for seepage of shale gas reservoir development based on microseismic data and embedded fracture modeling

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