Major Controlling Factors and a Method for Predicting Bioclastic Limestone Reservoirs in Da'anzhai, Northern Sichuan

doi:10.11885/j.issn.1674-5086.2019.03.04.06

Abstract

Abstract: The aim of this study was to clarify the characteristics and major factors controlling the formation and development of bioclastic limestone reservoirs in the lake facies of the Da'anzhai Member in Northern Sichuan, and to search for favorable reservoir development zones. Through drilling core description, thin slice identification, scanning electron microscope observation and test analysis, we performed a study on the sedimentology and reservoir characteristics in the area. According to our findings, the Da'anzhai Member in Northern Sichuan Basin is a shallow-lake-semi-deep-lake facies deposit. In the shallow-lake subfacies develops the bioclastic beaches, inter-beach depressions, and shallow-lake mud micro-facies, whereas in the semi-deep lake subfacies develops the beachfront lake slope and semi-deep lake mud micro-facies. Dominated by bioclastic limestone the reservoir is poor overall physical properties and is characteristic of ultra-low porosity and ultra-low permeability with average porosity of 1.18%, permeability less than 1 mD. The types of reservoir space are mainly corrosion pores, holes, and cracks. The predominant reservoir type is pore-fractured, while fracture-porosity reservoirs and fracture-type reservoirs also developed in the study area. Based on the results and analyses, the factors controlling the development of lake-facies bioclastic limestone reservoirs are discussed. We believe that favorable sedimentary facies belts, constructive diagenesis, and the fracture system control the development of reservoirs in the Da'anzhai Member. Finally, we propose a targeted reservoir prediction method based on the stratigraphic characteristics of each layer in the Da'anzhai Member.

Key words: bioclastic limestone, sedimentary facies, reservoir characteristics, Da'anzhai Member, Sichuan Basin

CLC Number:

TE122

WANG Weidong, PENG Jun, XIA Qingsong, DUAN Guanyi, SUN Enhui. Major Controlling Factors and a Method for Predicting Bioclastic Limestone Reservoirs in Da'anzhai, Northern Sichuan[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 13-21.

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