四川盆地普光地区嘉陵江组二段碳酸盐岩储层裂缝发育规律

doi:10.11743/ogg20200607

摘要/Abstract

摘要：

利用野外露头、岩心、薄片和测井资料，对四川盆地普光地区嘉陵江组二段（简称嘉二段）碳酸盐岩储层裂缝的参数特征、发育规律和控制因素开展综合分析。研究表明，普光地区嘉二段裂缝发育有北东-南西向、东西向、南北向和北西-南东向4组裂缝。其中北东-南西向为优势方位，裂缝以高角度裂缝为主，开度通常小于300 μm。裂缝孔隙度和渗透率计算结果表明，嘉二段裂缝的储集作用相对较弱，在储层中主要起到渗流通道的作用。垂向上，裂缝主要发育在嘉二段3个亚段膏岩下伏的白云岩段，嘉二中亚段裂缝最为发育。嘉二段储层裂缝的发育受构造、岩石力学层厚、岩性和成岩作用等因素控制。研究区现今水平最大主应力方位为近东西向，在开发过程中，东西向裂缝更容易优先开启，成为主要的渗流通道，同时北东-南西向裂缝作为优势发育方位易形成定向的高渗带。

关键词: 裂缝, 碳酸盐岩, 嘉陵江组, 普光地区, 四川盆地

Abstract:

The parameter characteristics, development pattern and controlling factors of fractures in carbonate reservoirs in the second member of the Jialingjiang Formation (Jia 2 member) in the Puguang area, Sichuan Basin, are analyzed through an integrated study of outcrop, core and thin section observations as well as logging data of the member.The results show that the member contains 4 sets of well-developed fractures of NE-SW-, E-W-, N-S- and NW-SE-trending.The dominant fractures of NE-SW strike are mainly those with a high dip-angle and an aperture normally less than 300 μm.The porosity and permeability calculation shows that the fractures serve as seepage channels rather than reservoiring space.Vertically, the fractures are mainly developed in the dolomite underlying the gyprock in each of the three sub-members, of which the middle sub-member has the most developed fractures.Factors such as the structure, rock mechanical stratigraphic thickness, lithology and diagenesis, control the development of the fractures.The present major principal stress is measured to be nearly E-W orientied, making the E-W striking fractures the most prone to be initiated as the chief flow channels in exploitation, and the NE-SW striking fractures of a preferred direction more likely to form high-permeability zones.

Key words: fracture, carbonate rock, Jialingjiang Formation, Puguang area, Sichuan Basin

中图分类号:

TE122.2

祖克威,范凌霄,王波,等. 四川盆地普光地区嘉陵江组二段碳酸盐岩储层裂缝发育规律[J]. 石油与天然气地质, 2020, 41(6): 1188-1196. doi: 10.11743/ogg20200607 Kewei Zu,Lingxiao Fan,Bo Wang,et al. Development patterns of fractures in carbonate reservoirs in the 2^nd member of Jialingjiang Formation, Puguang area, Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(6): 1188-1196. doi: 10.11743/ogg20200607

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裂缝发育带宽度/m	倾角/ (°)	斜向断距/m	曲率/ (km^-1)	断层延伸长度/m	断层走向
752.00	50	511.719 7	5.628 112	14 782	北西-南东
915.66	50	219.308 4	5.628 112	11 481	北西-南东
1 036.00	36	353.870 7	2.618 654	9 541	北西-南东
729.00	52	147.206 1	2.618 654	9 673	北西-南东
503.00	68	554.256 3	1.409 710	14 782	北东-南西
346.00	74	75.705 28	1.409 710	11 481	北东-南西
407.88	66	207.298 4	2.403 311	9 541	北东-南西
271.00	76	131.263 4	2.403 311	9 673	北东-南西

井名	深度/m	东西向裂缝开启压力/MPa	北东向裂缝开启压力/MPa	北西向裂缝开启压力/MPa	南北向裂缝开启压力/MPa
PG1	4 845~4 908	35.75	45.25	80.75	83.25
PG2	4 337~4 395	34.59	44.41	80.59	83.41
PG4	5 025~5 085	36.59	44.41	81.58	82.81
PG5	4 255~4 307	34.93	44.06	80.86	83.06
DW1	4 508~4 553	35.72	45.1	80.55	83.1
DW2	4 209~4 275	35.01	43.99	81.01	82.99
LB1	2 393~2 462	32.68	42.22	78.88	81.11
LJ1	5 412~5 488	37.29	46.27	80.73	83.27
DY1	3 948~4 005	34.64	44.31	80.93	83.07
F1	4 509~4 563	35.57	43.42	81.58	82.42
F2	5 945~6 012	38.62	48.88	80.84	86.16

井名	深度/m	裂缝优先开启方位	预测裂缝水侵方向	实测裂缝水侵方向
PG103	5 036~5 074	东西	东西	近东西
PG203	5 254~5 288	东西	东西	近东西
PG204	5 570~5 608	东西	东西	近东西
PG105	5 305~5 340	东西	东西或北东-南西	北东-南西

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