南川区块平桥背斜页岩气开发层系划分及合理井距优化研究

doi:10.13809/j.cnki.cn32-1825/te.2021.02.010

Abstract

Abstract:

The gas-bearing shale in Wufeng-Longmaxi Formation of Pingqiao anticline in Nanchuan block is thick. Currently, the low vertical producing reserves, underused oil-bearing area remains in the development in the same layer series with the horizontal well spacing of 500 m, leading to the failure of fully exploitation of shale reserves. In order to guide reasonable and efficient development, and improve the reserve production degree and enhance recovery rate, based on the fine description of the reservoir, the description of the rock microfacies and stress characteristics in the vertical direction has been focused on, and the impact on the fracture height and fracture length has been clarified. By the microseismic monitoring, historical fitting of gas well production data and other technical methods, the division of the development layer series and the plane reasonable well spacing optimization have been determined. It is found that: firstly, the gas-bearing shale of Wufeng-Longmaxi Formation in Nanchuan area can be divided into nine small layers and 21 sub layers, and the development layer can be divided into two sets of gas layers. The lower ①—⑤ layer are with the thickness of 35 m, while upper ⑥—⑨ layer are with the thickness of 76 m. Secondly, the reasonable horizontal well spacing of Pingqiao anticline is 250 m.

Key words: shale gas, multiple layer series development, reasonable well spacing, Wufeng-Longmaxi Formation, horizontal well, Nanchuan Block

CLC Number:

TE122.2

FANG Dazhi,QIAN Jin,MEI Junwei,REN Jianhua,MA Bo,LU Bi. Layer series division for development of shale gas of Pingqiao anticline in Nanchuan Block and reasonable well spacing optimization[J].Reservoir Evaluation and Development, 2021, 11(2): 212-218.

Figures/Tables 6

Table 1

Fig. 1

Table 2

Fig. 2

Fig. 3

Fig. 4

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层位	页岩厚度（m）	TOC （%）	孔隙度（%）	含气饱和度（%）	吸附含气量（m³/t）	总含气量（m³/t）	储量丰度（10⁸m³/km²）
⑥—⑨	76	1.5	2.8	47.6	1.0	3.2	5.9
①—⑤	35	3.2	4.2	70.0	1.8	4.3	4.8

分类	地质甜点					工程甜点
亚层	TOC （%）	孔隙度（%）	总含气量（m³/t）	吸附气含量（m³/t）	含气饱和度（%）	最小水平主应力（MPa）	石英+长石含量（%）	黏土含量（%）
⑧-2	1.8	3.6	2.7	0.8	41.0	54.0	37.1	44.8
①-2	4.9	5.2	6.3	1.7	64.5	54.1	69.2	18.9

Layer series division for development of shale gas of Pingqiao anticline in Nanchuan Block and reasonable well spacing optimization

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