Development patterns of fractures in carbonate reservoirs in the 2<sup>nd</sup> member of Jialingjiang Formation, Puguang area, Sichuan Basin

Kewei Zu; Lingxiao Fan; Bo Wang; Dongsheng Cao; Cong Guan; Zhongchao Li; Xiushen Cheng

doi:10.11743/ogg20200607

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Development patterns of fractures in carbonate reservoirs in the 2^nd member of Jialingjiang Formation, Puguang area, Sichuan Basin
Vol. 41, Issue 6, Pages: 1188-1196(2020)
Received：16 April 2019，

Published：28 December 2020
DOI： 10.11743/ogg20200607
稿件说明：

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DOI：

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. DOI：

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。

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.

关键词

Keywords

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