深层页岩气源储耦合机理研究——以川南地区X井为例

doi:10.13809/j.cnki.cn32-1825/te.2020.05.003

Abstract

Abstract:

Taking well-X, a typical core well of the Wufeng-Longmaxi Formation in Southern Sichuan Basin, as an example, based on core observation, geochemical analysis, X-ray diffraction, physical properties testing, argon ion polishing SEM, hydrocarbon generation simulation and other testing methods, and by using the research idea of “source-storage coupling”, the properties of the core segment as the “source” and the “storage” respectively are analyzed, and the mechanism of “source-storage coupling” is further discussed. The research results show that the bottom shale in Wufeng-Longmaxi Formation is characterized by sapmpelic kerogen, abundant organic matter, and high degree of thermal evolution, in which dry gas mainly generate. The average porosity of matrix is 6.5 %, mainly are inorganic pores. The inorganic pore types are mainly intergranular pore, clay mineral pore, feldspar alteration pore and pyrite intergranular pore. The average amount of adsorbed gas under formation temperature and pressure conditions is 0.9 m³/t. The average permeability is 0.38×10^-3 μm², which means it belongs to an ultra-low permeability reservoir. Generally speaking, the well-X has sufficient “source” at the bottom of the Wufeng-Longmaxi Formation with large amount of generated gas. The current stagnant gas volume is only about 54.8 % of the amount of generated gas, and the matrix pores are mainly inorganic pores. Meanwhile, organic pores are an important supplement. Free gas is the main body. The development of organic-rich shale section improves the permeability of the reservoir. At the same time, the biogenic siliceous minerals enhance the brittleness of the reservoir and make the reservoir easy to be fractured. Therefore, the organic-rich shale section is the best source-storage coupling interval, and also is the main interval of shale gas exploration and development and the key target layer of a horizontal well.

Key words: shale in Wufeng-Longmaxi Formation, source-storage coupling, Southern Sichuan Basin, deep layer, occurrence, gas content

CLC Number:

TE122

YANG Zhenheng,HU Zongquan,XIONG Liang,DING Jianghui,SHEN Baojian,SHI Hongliang,LU Longfei,WEI Limin,LI Zhiming. Gas storage characteristics and coupling characteristics of deep shale gas: a case study of well-X in southern Sichuan basin, China[J].Reservoir Evaluation and Development, 2020, 10(5): 20-27.

Figures/Tables 12

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小层	样品个数/个	温度/ ℃	兰氏体积V_L/ （m³·t^-1）		换算地层吸附气量/（m³·t^-1）
小层	样品个数/个	温度/ ℃	范围	平均值	范围	平均值
①—⑨	61	110	0.05~5.08	1.91	0.02~2.51	0.95
⑤—⑨	20	110	0.05~1.37	0.69	0.02~0.77	0.35
①—④	41	110	1.20~5.08	2.50	0.57~2.51	1.25

小层	样品个数/ 个	渗透率/10^-3μm²		BRIT/%
小层	样品个数/ 个	范围	平均值	范围	平均值
①—⑨	52	0.000 1~128.00	4.64	34~81	54.2
⑤—⑨	17	0.000 1~ 2.12	0.38	34~52	34.3
①—④	35	0.000 4~128.00	6.71	38~81	59.5

样品	TOC	R_o	有机质类型	黏土	石英	长石	碳酸盐岩矿物	黄铁矿
广元大隆组页岩样	9.62	0.64	Ⅱ₁	29.0	36.0	2.0	28.0	4.0
X井五峰—龙马溪底部优质页岩	0.06~6.04	2.10~2.20	Ⅰ	（15.1~61.0）/32.8	（18.0~69.2）/36.9	（0.1~10.2）/3.1	（2.0~29.6）/24.0	（1.0~7.3）/3.2

小层	总孔隙度	无机孔孔隙度	无机孔占比	有机孔孔隙度	有机孔占比
①—⑨	6.5	4.8	75.0	1.7	25.0
⑤—⑨	5.3	4.7	89.9	0.6	10.1
①—④	7.1	4.9	67.8	2.2	32.2

小层	总含气量/（m³·t^-1）	游离气量/（m³·t^-1）	游离气占比/%	吸附气量/（m³·t^-1）	吸附气占比/%
①—⑨	5.8	4.8	82.8	1.0	17.2
⑤—⑨	3.8	3.4	89.5	0.4	10.5
①—④	6.8	5.5	80.9	1.3	19.1

Gas storage characteristics and coupling characteristics of deep shale gas: a case study of well-X in southern Sichuan basin, China

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