RESEARCH ARTICLE


Lacustrine Carbonate Reservoir Characteristics Research of Jurassic Da’anzhai Member in North Central Sichuan Basin



Du Jiangmin1, 2, *, Zhang Xiaoli1, Yu Yanqiu2, Huang Kaiwei3, Guo Hongguang4, Zhong Gaorun1, Yu Bowei1, Zhao Yuanyuan2
1 State Key Laboratory of Continental Dynamics/ Department of Geology, Northwest University, Xi’an, Shanxi, 710069, P.R. China;
2 College of Resources, Shijiazhuang University of Economics, Shijiazhuang, Hebei, 050031, P.R. China;
3 Northeast SiChuan High-Sour Gas field Development and Construction Project Divison, Petro China Southwest Oil & Gas Field, Chengdu, Sichuan, 610051, P.R. China;
4 CNPC Logging Changqing Business Division, Xi’an, Shanxi, 710201, P.R. China


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© 2015 Jiangmin et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: * Address correspondence to this author at the Department of Geology, Northwest University, Xi’an, Shanxi, 710069, P.R. China; Tel: +86 15230163012; Fax: +86 311 87208285; E-mail: jiangmindu@163.com


Abstract

Based on both macroscopic and microscopic characteristics of cores from Lower Jurassic Da’anzhai Member in north central Sichuan Basin, and combined with physical property data, a detail study has been conducted, which includes reservoir characteristics such as lithologic characters, physical properties, and reservoir space types, and control factors of reservoir development. The study suggests that, there are two typical kinds of reservoirs: crystalline shell limestone and argillaceous shell limestone. The reservoirs properties are poor with ultra-low porosity and low permeability, which can be significantly improved by fractures. Reservoir space type is pore-fracture, mainly constitutive of the micro-fractures accompanied by dissolved pores. The reservoir development is controlled by sedimentation, diagenesis and tectogenesis together. Shell beach and lacustrine slop are the favorable facies for reservoir development. Dissolution is the primary constructive diagenesis to improve reservoir porosity and permeability. Structural fractures are necessary for reservoir effectiveness and high production.

Keywords: Control factor, Da’anzhai member, Lower Jurassic, North central Sichuan Basin, Reservoir characteristics.