Characteristics and Main Controlling Factor of Shoal Reservoir Developed in Jialingjiang Formation of Zigong Area, Southwestern Sichuan

doi:10.11885/j.issn.16745086.2016.04.27.02

Abstract

Abstract: Compared with the large-scale bending distribution of a platform margin shoal, shoal within the epicontinental platform has various disadvantages. These are the small scale of a single shoal, thin reservoir thickness, strong reservoir heterogeneity, random horizontal distribution, and seismic prediction difficultly. In an attempt to solve these problems, the Lower Triassic Jialingjiang Formation of the Zigong area, Sichuan Basin, was used as study area. Drill core observation, slice identification, physical analysis, mercury injection, and well logging were employed to analyze the basic characteristics and main controlling factors of the shoal reservoir within the epicontinental sea platform. The results show significant differences in the reservoir lithology, types of reservoir spaces, pore-throat structures and properties of pore, and the permeability of shoal within the epicontinental carbonate platform, i.e., the reservoir sh ows strong heterogeneity. The study results point to a typical facies-controlled reservoir, of which the development is jointly influenced by several factors. The polycyclic oscillation of the sea level determines the distribution type of the thin reservoir thickness and the vertical multiphase superimposed shoal within the platform. The shoal reservoir within the platform has strong horizontal heterogeneity in the early stage, which is controlled by secondary superficial differences in the platform. Syngenetic karstification is the main dissolution type in the reservoir. Dolomitization could improve reservoir permeability effectively, and structure fractures and burial dissolution could optimize the reservoir quality.

Key words: epicontinental sea, shoal within platform, Sichuan Basin, Jialingjiang Formation, main controlling factor of thin reservoir

CLC Number:

TE122

LIU Hong, WANG Gaofeng, LIU Nan, QIAO Lin, CUI Jian. Characteristics and Main Controlling Factor of Shoal Reservoir Developed in Jialingjiang Formation of Zigong Area, Southwestern Sichuan[J]. 西南石油大学学报(自然科学版), 2017, 39(5): 1-9.

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