川东五百梯长兴组台缘生物礁储层沉积学特征
网络出版日期: 2011-06-20
基金资助
中国石油西南油气田分公司项目(编号:20090302-02-02)“川东长兴组生物礁地质特征与分布规律研究”资助
Sedimentary characteristics of platform margin reef reservoir of Upper Permian Changxing Formation in Wubaiti area, eastern Sichuan
Online published: 2011-06-20
王宏 , 王蓓蕾 , 王成俊 . 川东五百梯长兴组台缘生物礁储层沉积学特征[J]. 岩性油气藏, 2011 , 23(3) : 60 -69 . DOI: 10.3969/j.issn.1673-8926.2011.03.012
There are four facies belts developed in Changxing Formation inWubaiti area, including intraplatformtrough (deep water basin), platform slope, platform margin reef flat and open platform. The platform marginal facies of continental shelf around intraplatform trough developed well. It is across entire eastern Sichuan and extends hundreds of kilometers, and it is the most important facies for seeking reef gas reservoir. The platformmargin reef in Wubaiti area can be divided into five subfacies, including reef base, reef core, reef crest, reef front and reef behind, amongwhich reef core and reef crest are the most favorable subfacies for the reservoir development. The reservoir rocks are mainly dolomite of reef and shoal facies and grain dolomite. Hummocky disorder reflection and chimney effect in seismic profile can be used to effectively predict reef reservoir. Dolomitization and dissolution are not only the key factors for controlling the forming of reef gas reservoir, but also the basis for forming high quality reef reservoir. The fracture raises the porosity and permeability of reservoir.
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