川东北元坝地区长兴组生物礁白云岩成因机理

doi:10.11743/ogg20170410

Abstract

Abstract: Dolostones of the Upper Permian Changxing Formation are the major reservoir rock type of the bioherm gas pool in Yuanba area,Northeastern Sichuan Basin.The formation of the reefal dolostone reservoir in the Changxing Formation is principally influenced by both dolomitization and dissolution.In order to reveal the genetic mechanism of bioherm dolostone,core observation,petrographic and geochemical analyses were integrated to study different types of dolomites and their characteristics of the Changxing Formation dolostone and determine the types and stages of dolomitization of the dolostone reservoir.Four types of dolomitization were identified,including syngenetic evaporative dolomitization and seepage-reflux dolomitization under high salinity,shallow burial dolomitisation and hydrothermal dolomitization of early diagenesis.The three stages of dolomitization control the quality and distribution of the reefal dolostone reservoirs of the Changxing Formation in Yuanba area.

Key words: dolomitization, genetic mechanism, reefal dolostone, Changxing Formation, Yuanba area, Sichuan Basin

CLC Number:

TE122.1

Xu Shoucheng, Li Guorong, Zhang Xiaoqing, Wu Yajun, Jing Xiaoyan, Liu Yuanyang. Genetic mechanism of reefal dolostones of the Changxing Formation in Yuanba area,northeastern Sichuan Basin[J]. Oil & Gas Geology, 2017, 38(4): 729-740.

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Genetic mechanism of reefal dolostones of the Changxing Formation in Yuanba area,northeastern Sichuan Basin

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