Comparison of Dolomite Reservoir Characteristics Between the Northern Tarim Basin and Lower Qiulitage Group of Bachu

doi:10.11885/j.issn.1674-5086.2017.01.23.04

Abstract

Abstract: This study investigated differences in dolomite reservoir characteristics between the Northern Tarim Basin and the Lower Qiulitage Group of Bachu in terms of petrology, reservoir space, physical properties, porous structure, etc., through rock core description, rock thin section assessment, cathodoluminescence, scanning electron microscopy, physical property analysis, and mercury injection data. The results show that dolomite in the Northern Tarim Basin is mainly crystalline or granular. The reservoir space primarily comprises intercrystalline pores, intercrystalline dissolution pores, dissolution cavities, and fissures in various combinations. The pore throat is mainly of the coarse-fine type with good sorting and even distribution. The connectivity and physical properties are both good. Tectonic fractures and karstification also developed in this area, improving the physical properties of the reservoir. The Bachu area is dominated by crystalline dolomite and silty dolomicrite. The development and scope of dissolution cavities and fissures are much lower than in the Northern Tarim Basin, with less varied reservoir space combinations. The pore throat is mainly of the fine-micro type with poor sorting and uneven distribution. The connectivity and physical properties are also poor. The physical properties of the dolomite reservoir in Northern Tarim Basin are better than that in the Bachu area. This difference is mainly caused by the combined effects of sedimentation and diagenesis.

Key words: Northern Tarim Basin, Bachu area, Lower Qiulitage Group, dolomite reservoir, pore structure

CLC Number:

TE122

PENG Jun, CAO Junjiao, LI Bin, XIA Qingsong, LIU Xinyu. Comparison of Dolomite Reservoir Characteristics Between the Northern Tarim Basin and Lower Qiulitage Group of Bachu[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 1-14.

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