Characteristic and Developmental Controlled Factors of Pre-salt Lacustrine Carbonate, Santos Basin

doi:10.11885/j.issn.1674-5086.2019.07.18.02

Abstract

Abstract: The lacustrine carbonate of pre-salt in Santos Basin is rich in oil and gas resources, a hotspots of exploration in the world. Based on analysis of cores, thin sections from 41 wells, we determine two types of carbonate developed including microbial reef strobitolites limestone and bioclastic bank coquinas. The lacustrine carbonate is porous limestone reservoir, medium porosity and permeability. The main pore type is primary pore, which had undergone reconstruction from later dissolution. Analysis of C-O isotope data and Ostracoda materials leads to the conclusion that three main elements, paleo-salinity of water, paleo-structure, sedimentary facies, are the main control factors lacustrine carbonate reservoir development. Genesis types of carbonate reservoir is controlled by paleo-salinity of water. Distribution of reservoir is controlled by paleo-structure. And physical property of reservoir is controlled by sedimentary facies. Eastern uplift zone and lower horsts of central depression zone is the favorable area to develop lacustrine carbonate reservoir, helpful to direct exploration deployment.

Key words: lacustrine carbonate, reservoir, Santos Basin, pre-salt, Brazil

CLC Number:

TE122

JIA Huaicun, KANG Hongquan, LIANG Jianshe, CHENG Tao, ZHANG Shixin. Characteristic and Developmental Controlled Factors of Pre-salt Lacustrine Carbonate, Santos Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 1-9.

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