埋藏过程中膏岩封闭有效性演化特征——以塔里木盆地寒武系深层膏岩盖层为例

doi:10.11743/ogg20210610

Abstract

Abstract:

Gypsolyte has been widely accepted as a superior caprock for oil and gas reservoirs. However, not all gypsolytes are of effective sealing capacity, to which certain geological conditions are in need. The core and outcrop gypsolyte samples taken from the Tarim Basin are applied to carry out scanning electron microscopy (SEM), physical property analysis, breakthrough pressure test and triaxial stress test. The results suggest that (1) both gypsolyte and saline rock initially formed are of strong sealing capacity, which tends to grow weaker as the gypsum under dehydration transforms into anhydrite during evolution under burial, and the spaces formed thereby undermine its sealing performance; (2) The maximum burial depth at which gypsum-to-anhydrite transformation occurs is about 2000 m in the Tarim Basin, and the anhydrite developed under dehydration is significantly different from the initial gypsum in terms of shear resistance; (3) During the evolution process under burial, the sealing properties of gypsolyte are constantly changing under different formation temperatures and confining pressures, and it all depends on the sealing capacity and shear resistance of the gypsolyte under burial whether the gypsolyte can be eventually developed into effective caprock.

Key words: dehydration, breakthrough pressure, sealing capacity, triaxial stress test, gypsum, anhydrite, gypsolyte caprock, Tarim Basin

CLC Number:

TE122.2

Tong Lin, Tongshan Wang, Wenqing Pan, Wenfang Yuan, Qiufen Li, Wei Ma. Evaluation of sealing effectiveness of gypsolyte during burial: A case study of the gypsolyte caprock in deep Cambrian, Tarim Basin[J]. Oil & Gas Geology, 2021, 42(6): 1354-1364.

Figures/Tables 8

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样品编号	岩性	地层	孔隙度/%	渗透率/ （10^-3 μm²）	突破压力/MPa
W-st1-1	细晶硬石膏	${{\rm{\rlap{-} C}}_1}x$	2.85	0.003 78	3.1
W-st1-2	粉晶硬石膏	${{\rm{\rlap{-} C}}_1}x$	2.43	0.002 86	3.5
W-zhs4-1	硬石膏	${{\rm{\rlap{-} C}}_2}a$	6.05	0.386 15	0.5
W-zhs4-2	粉晶硬石膏	${{\rm{\rlap{-} C}}_2}a$	3.50	0.016 84	1.9
W-bt5-1	盐岩	${{\rm{\rlap{-} C}}_2}a$	0.65	0.000 03	23.9^*
W-tc2-1	细晶硬石膏	E₁a	3.90	0.227 95	1.7
W-tc2-2	白云质细晶硬石膏	E₁a	2.40	0.196 10	4.1
W-tc2-3	中-细晶硬石膏	E₁a	5.85	1.195 68	0.5
W-tc2-4	细晶硬石膏	E₁a	4.95	0.261 98	0.9
W-tc2-5	细晶硬石膏	E₁a	2.90	0.438 37	3.1
W-tc2-6	细晶硬石膏	E₁a	2.00	0.019 29	5.1
W-gd1-2	细晶硬石膏	C	1.55	0.014 90	6.1
O-xhz	石膏	C₁₊₂k	6.80	0.058 20	1.5
O-awt	盐岩	E₁₊₂	0.70	0.000 02	23.9^*

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Evaluation of sealing effectiveness of gypsolyte during burial: A case study of the gypsolyte caprock in deep Cambrian, Tarim Basin

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