川东南地区娄山关群白云岩储层特征及主控因素

doi:10.3969/j.issn.1673-8926.2016.05.005

Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 44-51.doi: 10.3969/j.issn.1673-8926.2016.05.005

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Characteristics and main controlling factors of dolomite reservoirs of Cambrian Loushanguan Group in the southeastern Sichuan Basin

Jiang Wenjian¹， Hou Mingcai ^1，2， Xing Fengcun ^1，2， Li Yong3， Shi Xin¹， Wang Chao^1，4

（1. Institute of Sedimentary Geology， Chengdu University of Technology， Chengdu 610059， China； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China；3. No. 208 Research Institute of Nuclear Industry， Guanghan 618300， Sichuan， China； 4. North China Petroleum Engineering Co. Ltd.， Sinopec， Zhengzhou 450000， China）

Online:2016-09-29 Published:2016-09-29

Abstract

Abstract:

A large number of dolomite developed in Cambrian Loushanguan Group in the southeastern Sichuan Basin, with good oil and gas exploration prospect. However, the exploration degree in the study area is relatively low, and there are few studies on the characteristics of dolomite reservoir. Based on the outcrop observation, combined with cast thin section observation and physical property test of the samples from Jingzhu and Zhongba profile, the data of petrology, reservoir space and physical properties were applied to study the characteristics and main controlling factors of dolomite reservoirs. The result shows that the reservoir rocks are mainly crystalline dolomite and grain dolomite, the main reservoir spaces are intercrystalline pores and intercrystalline dissolved pores, intergranular pores, intergranular dissolved pores and nonselective dissolved pores. The porosity is well correlated to permeability, but pores varied greatly in different types of rock. The dolomite reservoir quality is affected by multiple factors, and the high energy environment controls reservoir distribution. The dolomitization and hydrothermal fluid dissolution improve the reservoir properties. The good quality reservoirs are mainly developed at the top of the upward shallowing cycles of the third?order sequence. This study results are basis for the next hydrocarbon exploration in the southeastern Sichuan Basin, and reference for the study on dolomite reservoir in other areas.

Key words: limestone reservoir, ramp facies, controlling factor, Callovian-Oxfordian, Bieshikent Depression, Turkmenistan

Jiang Wenjian， Hou Mingcai， Xing Fengcun， Li Yong， Shi Xin， Wang Chao. Characteristics and main controlling factors of dolomite reservoirs of Cambrian Loushanguan Group in the southeastern Sichuan Basin[J].Lithologic Reservoirs, 2016, 28(5): 44-51.

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