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

摘要/Abstract

摘要：

南川区块平桥背斜五峰—龙马溪组含气页岩厚度大,目前采用一套层系开发,水平井井距500 m的条件下,存在着纵向动用程度低,平面动用不充分,未能实现页岩储量的充分动用。为了指导该地区页岩气的合理高效开发,提高储量动用程度和采收率,基于储层精细描述,重点刻画纵向上岩石微相及应力特征,明确其对压裂缝高和缝长的影响,利用微地震监测、气井生产数据历史拟合等技术方法,明确开发层系的划分和平面合理井距的优化。研究结果：①南川地区五峰—龙马溪组含气页岩划分为9个小层21个亚层,开发层系划分为上、下2套气层,其中下部气层为①—⑤小层,厚度35 m,上部气层为⑥—⑨小层,厚度76 m;②平桥背斜合理水平井间距在250 m。

关键词: 页岩气, 立体开发, 合理井距, 五峰组—龙马溪组, 水平井, 南川区块

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

中图分类号:

TE122.2

房大志,钱劲,梅俊伟等. 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[J]. 油气藏评价与开发, 2021, 11(2): 212-218.

Dazhi FANG,Jin QIAN,Junwei MEI, et al. 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.

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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