四川盆地侏罗系自流井组大安寨段陆相页岩油气地质特征及成藏控制因素

doi:10.11743/ogg20210111

Abstract

Abstract:

Hydrocarbon exploration in the terrestrial Jurassic system of Sichuan Basin has been focused on conventional tectonically fractured reservoirs and unconventional coquina and tight sandstone reservoirs.However, shale reservoirs are regarded as the new focal point for making significant breakthroughs in the system of the basin.Based on an analysis of the distribution, generation, reservoir properties and preservation conditions of the terrestrial shale oil/gas in the Da'anzhai Member of Ziliujing Formation, we conclude that the member is favorable for a large-scale shale oil and gas accumulation in terms of its geological features and that three factors serve to control the accumulation.Geologically, the 20-80 m thick dark shale with oil and gas shows in the 2^nd sub Da'anzhai Member is both excellent source rock and over-pressured oil/gas reservoir sandwiched between cap and bottom tight limestones with its wide and continuous distribution, large thickness, well-developed pores and fractures, good physical properties, and medium-high maturity.The three factors including the semi-deep and deep lacustrine sub-facies, high-porosity reservoirs between the top and bottom limestones and medium-high maturity, jointly control the generation, preservation, enrichment of oil and gas in the shale.

Key words: geological condition, accumulation controlling factor, terrestrial shale oil & gas, Da'anzhai Member, Ziliujing Formation, Lower Jurassic, Sichuan Basin

CLC Number:

TE122.3

Shasha Sun, Dazhong Dong, Yucong Li, Hongyan Wang, Zhensheng Shi, Shiwei Huang, Yan Chang, Wenhua Bai. Geological characteristics and controlling factors of hydrocarbon accumulation in terrestrial shale in the Da'anzhai Member of the Jurassic Ziliujing Formation, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(1): 124-135.

Figures/Tables 10

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Table 1

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Table 4

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地区	井数/口	平均厚度/m	最小厚度/m	最大厚度/m
龙岗	26	64.3	50.0	82.0
营山	8	62.0	56.0	68.0
广安	61	51.0	36.4	67.1
南充	10	51.0	33.5	64.5
八角场	7	37.5	28.6	48.5
公山庙	11	50.8	46.9	57.0
合川	10	21.7	12.6	33.7
潼南	7	13.5	9.2	16.0
遂宁	15	22.0	16.0	24.0
涪陵	4	44.8	37.7	59.3

井名	深度/m	岩性	密度/(g·cm^-3)	杨氏模量/GPa	泊松比
蓬莱10井	1 984.44~1 984.56	页岩	2.57	37.6	0.29
蓬莱10井	2 009.02~2 009.18	页岩	2.54	71.0	0.28
XL101^[26]	2 240.22~2 246.31	页岩	-	25.8	0.23
XL101^[26]	2 144.00~2 150.00	页岩夹灰岩	-	31.1	0.21

岩相	厚层块状纯页岩相	页岩夹薄层灰岩相	页岩与介屑灰岩不等厚互层相
典型岩心照片
沉积相	半深湖-深湖	湖坡	浅湖
分布层段	大二段	大二段	大一段
有机质丰度
剖面类型

盆地	美国		中国
盆地	Williston盆地	Maverick盆地	四川盆地	四川盆地
地层	上泥盆统Bakken	上白垩统Eagle Ford	侏罗系大安寨段	志留系龙马溪组
有利页岩厚度/m	3~15	45~100	20~80	30~70
主要开采类型	页岩夹砂岩型	页岩、碳酸盐岩薄互层	灰岩夹页岩型	页岩
埋深/m	2 100~3 300	2 130~3 650	2 000~3 500	2 000~4 500
沉积相	海相	海相	湖相	海相
有机质类型	Ⅰ, Ⅱ	Ⅰ, Ⅱ	Ⅱ	Ⅰ, Ⅱ
TOC/%	7.2~10.6	3.7~4.5	0.8~3.0	0.4~9.6
R_o/%	0.6~1.0	1.0~1.3	0.9~1.5	2.3~2.8
孔隙度/%	8~12	5~14	0~10	2~10
渗透率/(10^-3 μm²)	0.05~1.00	0.01~0.80	0.08~9.79	0.01~0.60
密度/(g·cm^-3)	＜0.82	0.82	0.76~0.87	2.37~2.60
气油比/(m³/t)	80~426	513~5 041	153~6 720	不存在
孔隙特征	有机孔	有机孔	无机孔+有机孔	有机孔
压力系数	1.35~1.58	1.35~1.80	1.23~1.72	1.20~2.10
脆性矿物含量/%	＞90	50~80	45~70	50~90

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Geological characteristics and controlling factors of hydrocarbon accumulation in terrestrial shale in the Da'anzhai Member of the Jurassic Ziliujing Formation, Sichuan Basin

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