复杂构造区页岩气富集特征—以四川盆地东南部丁山地区下古生界五峰组-龙马溪组为例

doi:10.11743/ogg20210108

Abstract

Abstract:

The Dingshan area in southeastern Sichuan Basin is one of the focal points for shale gas exploration and development in China.Despite some promising test results achieved from several wells drilled in the area, the subsequent rapid production decline rate and low EUR estimations make their development uneconomical.To tackle the problem, efforts were exerted to the characterization of shale gas accumulations and predication of potential exploration targets in such areas.The representative Wufeng-Longmaxi Formation shale in the Dingshan area was chosen to conduct analyses of the shale rock types, distribution characteristics, reservoir types and gas content by means of core observation, identification and correlation of graptolite belts and scanning electron microscope (SEM) observation.The results show that there are four types of shale: siliceous shale, lime-calcareous shale, clayey shale and silty shale.Among them, the siliceous shale in the graptolite belt of the second member of the Wufeng Formation and the fourth member of the Longmaxi Formation (WF2-LM4) is potentially high-quality shale rocks with a thickness of 6 m to 10 m.The reservoir space is mainly organic-matter pores, mineral pores and micro-fractures.The dissolution pores that are well developed near the margin of the basin are found to be no signs of asphalt, indicating a poor preservation condition for shale gas.Compared with the Fuling shale gas field, the siliceous shale rocks in the graptolite belts in the Dingshan area are thinner, with those buried shallow in the faulting zone near the edge of the basin containing shallow normal-pressure gas reservoirs of low formation pressure coefficients, and those distributed basinward having deep, over-pressure gas reservoirs of high pressure coefficient.It is suggested that the exploration of shale gas should be focused on parts with large thickness, moderate burial depth and good preservation conditions in the WF2-LM4 zones of southeastern Sichuan Basin.

Key words: graptolite belt, tectonic uplift, reservoir space, high-quality shale, shale gas, Wufeng-Longmaxi Formations, Lower Paleozoic, southeastern Sichuan Basin

CLC Number:

TE122.2

Zhiyuan Lu, Zhiliang He, Chuan Yu, Xin Ye, Donghui Li, Wei Du, Haikuan Nie. Characteristics of shale gas enrichment in tectonically complex regions-A case study of the Wufeng-Longmaxi Formations of Lower Paleozoic in southeastern Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(1): 86-97.

Figures/Tables 7

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Table 1

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井号	深度/m	厚度/m	有机地化指标			物性		含气性		矿物含量			产量/(10⁴ m³·d^-1)
井号	深度/m	厚度/m	TOC/%	R_o/%	有机质类型	孔隙度/%	渗透率/(10^-3 μm²)	油气显示	总含气量/(m³·t^-1)	硅质/%	碳酸盐/%	粘土/%	产量/(10⁴ m³·d^-1)
DY1	2 028.0~2 054.0	7.53	3.52	2.14	Ⅰ	3.03	0.716	差	3.07	40.0	10.0	38.0	3.45
DY2	4 332.0~4 367.5	9.75	3.95	2.24	Ⅰ	4.98	0. 104	好	6.79	38.9	15.6	36.8	10.57
JY1	2 378.0~2 415.0	24.62	3.77	2.65	Ⅰ	4.65	0.187	好	5.85	44.8	9.7	34.3	-

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Characteristics of shale gas enrichment in tectonically complex regions-A case study of the Wufeng-Longmaxi Formations of Lower Paleozoic in southeastern Sichuan Basin

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