四川盆地东部南川常压页岩气开发效果地质与工程因素分析

doi:10.13809/j.cnki.cn32-1825/te.2021.04.012

Abstract

Abstract:

Nanchuan Block is rich in shale gas resources, and the proven reserves of Pingqiao and Dongsheng structural belts are nearly 2 000×10⁸ m³, mainly in normal pressure shale gas reservoir, with complex structure and stress, and relatively poor resource quality. Affected by the preservation conditions, burial depth, in-situ stress, complex structure, uneven fracture development and fracturing effect, the productivity of single wells on the same platform is quite different, and the test production, productivity and single well EUR of some wells have not been able to meet the expectation, all these above greatly limit the scale production and benefit development. By the comparative analysis of production effects of typical wells in geology, development and engineering, it is considered that formation pressure coefficient, development degree of natural fracture network, local complex structure and in-situ stress are the main factors affecting normal pressure shale gas development in resource implementation area. The pressure coefficient represents the driving energy of the formation, and a certain degree of natural fracture network can effectively improve the development effects. The local complex structure leads to a low drilling rate of high-quality shale, and the stress increase caused by extrusion deformation, deepening burial depth and excessive angle between horizontal section azimuth and minimum principal stress azimuth will limit the complexity of artificial fracture network to a certain extent. According to the plane difference distribution characteristics of main controlling factors, the basis of improving the development effects of normal pressure shale gas is to select the best from sweet spot and adjust the local optimization.

Key words: normal pressure shale gas, pressure coefficient, fracture development degree, crustal stress, development effect

CLC Number:

TE25

Chunfeng HU,Junwei MEI,Shizhao LI, et al. Analysis on geological and engineering factors of development effects on normal pressure shale gas in Nanchuan Block, eastern Suchuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 559-568.

Figures/Tables 16

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井号	低角度缝（条）	高角度缝（条）	总裂缝（条）	裂缝密度（条/m）
背斜（SY194-3）	20	143	163	1.75
东1断层（SY195-2）	135	281	416	5.25
翼部（SY201-1）	40	83	123	1.52

地质分区	埋深（m）	气测显示（%）	曲率及裂缝	初期套压（MPa）	测试产量（10⁴m³）	测试压力（MPa）	累产（10⁴m³）	EUR （10⁸m³）	返排率（%）
主体区	≤3 800	>15	高值/构造缝	27.6	24.8	17.4	5 872	1.04	16.6
东一区	≤3 500	10~15	中高值/微裂缝	30.6	39.5	23.3	7 537	1.30	25.9
两翼	≥3 800	<10	低值/裂缝欠发育	18.9	17.1	14.7	3 135	0.91	33.3
平均				25.1	25.1	17.7	5 230	1.08	24.6

Analysis on geological and engineering factors of development effects on normal pressure shale gas in Nanchuan Block, eastern Suchuan Basin

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