川东北地区下侏罗统自流井组大安寨段陆相页岩脆性特征及其控制因素

doi:10.11743/ogg20230209

Abstract

Abstract:

The brittleness features and their controlling factors of shale are clarified based on the systematic study of lithofacies and mineral composition， dynamic and static rock mechanical properties， and diagenesis of the Da’anzhai Member of the Lower Jurassic Ziliujing Formation in the northeastern Sichuan Basin. The following results are obtained. First， the continental shale sequence of the Da’anzhai Member is mainly composed of clayey shale， silty shale， shell limy clayey shale and shell limestone， featuring high content of clayey minerals and local enrichment of carbonate minerals. The source of felsic minerals is mainly terrigenous detritus， and the correlations between the TOC， clay， felsic and carbonate minerals are complex. Second， the brittleness of shale strata is under a joint effect of mineral content， mineral architecture and their interactions. The Da’?anzhai Member is at the middle diagenetic stage， with a low degree of concretion， and its felsic mineral content has a weaker effect on brittleness compared with carbonate minerals. The increasing content of calcareous shells leads to differences in dynamic and static rock mechanical parameters and reduces the energy consumed for rock fracturing and fracture propagation as required. Third， the interbeds in the Da’anzhai Member are diverse in type and complicated in mineral composition and architecture. The dynamic and static mechanical parameters of shale with interbeds of homogeneous architecture are in good positive correlation， while those of shale with interbeds of heterogeneous architecture （i.e. shell interbed） are in negative correlation in terms of Young’s modulus. In all， factors such as lithology， interbed type， differences in rock mechanical properties， and diagenesis should be fully considered to establish an evaluation system for the brittleness and fracability of continental shale in the Jurassic. The conclusions achieved above are of important referential value to deepening the understanding of the brittleness and the evaluation of geological-engineering sweet spots of continental shale reservoirs with interbeds of complex types.

Key words: brittleness, mineral composition, rock mechanics, elastic parameter, diagenesis, shale, Jurassic, Sichuan Basin

CLC Number:

TE122.2

Ruyue WANG, Zongquan HU, Fuqiang LAI, Yuejiao LIU, Zhonghu WU, Jianhua HE, Guan’gui ZOU, Pengwei WANG, Zhihao LI. Brittleness features and controlling factors of continental shale from Da’anzhai Member of the Lower Jurassic Ziliujing Formation， northeastern Sichuan Basin[J]. Oil & Gas Geology, 2023, 44(2): 366-378.

Figures/Tables 12

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Table 1

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Table 2

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样品编号	埋深/m	岩性	纵波速度/（m·s^-1）	横波速度/（m·s^-1）	动态杨氏模量/GPa	静态杨氏模量/GPa	泊松比
24-0	63.53	介壳灰岩	5 453	3 030	61.70	35.31	0.28
24-1	63.71		5 071	3 027	59.00	34.61	0.22
24-2	63.90		5 420	3 181	66.63	—	0.24
24-4	64.12		5 147	2 858	53.56	—	0.28
26-4	68.43	介壳灰质页岩	5 457	3 143	63.50	—	0.25
28-2	73.53		5 503	3 022	62.99	32.20	0.28
28-3	73.61		—	—	—	20.21	—
44-1	127.25		—	—	—	30.47	—
49-2	145.61		5 268	3 136	63.79	30.34	0.23
51-2	152.77	粉砂质页岩	5 417	3 161	66.51	31.21	0.24
45-0	128.35		5 557	3 077	64.73	34.84	0.28
45-1	128.38		5 535	3 193	68.85	35.96	0.25
45-2	128.45	泥质粉砂岩	5 633	3 336	73.45	37.57	0.23
45-3	128.57		5 785	3 351	74.82	42.65	0.25
45-13	131.81		5 642	3 343	73.75	36.70	0.23
45-4	128.75	含介壳泥质粉砂岩	5 776	3 331	74.31	46.49	0.25
51-1	152.61	含介壳粉砂质页岩	5 348	3 185	66.37	—	0.23

划分参数	分布范围	平均值	中成岩阶段划分标准		成岩阶段
划分参数	分布范围	平均值	A亚期	B亚期	成岩阶段
R_o/%	1.11～1.83	—	0.5～1.3	1.3～2.0	中成岩阶段A亚期晚期— 中成岩阶段B亚期中期
T_max/°C	371～501	468	435～460	460～490
黏土矿物组合类型	I+I/S+C+K		I+I/S+C+K	I+I/S+C
S在I/S中比例/%	4.00～30.00	15.53	15～50	<15

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Brittleness features and controlling factors of continental shale from Da’anzhai Member of the Lower Jurassic Ziliujing Formation， northeastern Sichuan Basin

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