基于VBM方法的油气藏高精度地层格架建模——以川西坳陷新场构造带须二段为例

doi:10.13809/j.cnki.cn32-1825/te.2022.02.005

Abstract

Abstract:

The Xujiahe Formation in Xinchang area of western Sichuan Depression has experienced multiple periods of tectonic movement superposition. The stratigraphic deformation is significant, and the whole stratum is characterized by “saddle” shape. In addition, several groups of reverse faults are developed, with different fault broken horizons and diverse fault crosscutting relationships. However, the conventional modeling methods can not accurately describe the complex structure-stratigraphic characteristics of the area, and the model is difficult to meet the actual production needs. Therefore, the VBM modeling method is used to establish the structural-stratigraphic framework model of Xu2 gas reservoir in Xinchang area. Based on the analysis of sedimentary and filling characteristics in the study area, the sequence stratigraphic framework is clarified. Then, the horizon and fault data are obtained based on seismic interpretation data and drilling stratification information to establish the model of fault frame and finely adjust the relation between sectional shape and cross section. The horizon model is used as the input data to calculate the stratigraphic thickness of each sand group, and to restore and construct the original formation model. The present structural-stratigraphic framework model can be established by accurately regulating the relation between faults and horizons by controlling the relevant parameters of them. The results show that VBM method can accurately describe complex structural model through volume conservation principle and tetrahedron grid characterization technology, and better deal with complex formation contact and fault distribution problems. The new stratigraphic framework model has higher grid quality than the traditional corner grid model, and the combination relation and sequence stratigraphic characteristics are maintained in the complex faults. This structural-stratigraphic model provides a more reliable model framework for the subsequent reservoir geological modeling.

Key words: stratigraphic framework, geological modeling, structural-stratigraphic model, volume-based modeling, Xinchang tectonic belt, western Sichuan Depression

CLC Number:

TE319

SHANG Xiaofei,WANG Mingchuan,LI Meng,ZHAO Lei. High precision stratigraphic framework modeling for oil and gas reservoirs based on VBM algorithm: A case study of Xu2 Formation in Xinchang tectonic zone, western Sichuan Depression[J].Reservoir Evaluation and Development, 2022, 12(2): 302-312.

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断层	断面分辨率（m）	断层平整度	断面形态	断层外推距离（m）	断层交切关系
F1	100	2	凸形	50	被F12截切
F2	100	2	凸形	50
F3	100	2	凸形	50
F4	100	2	凸形	50
F5	100	2	凸形	50
F12	60	1	凸形	30
F17	60	1	凸形	20	截切F1

砂组	平均层厚（m）	断层数	层序接触关系	断层影响距离（m）	垂向断距（m）	网格尺寸（m）
TX₂²	80	59	整合接触	上盘400、下盘80	40~50	100
TX₂⁴	110	46	整合接触	上盘300、下盘50	35~45	100
TX₂⁷	50	31	整合接触	上盘200、下盘30	30~40	100

High precision stratigraphic framework modeling for oil and gas reservoirs based on VBM algorithm: A case study of Xu2 Formation in Xinchang tectonic zone, western Sichuan Depression

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