泰国呵叻盆地二叠系Pha Nok Khao组碳酸盐岩沉积相特征

发布时间：2018-03-10 08:12

本文选题：呵叻盆地　切入点：二叠系　出处：《沉积学报》2017年04期 　论文类型：期刊论文

【摘要】：通过研究区3口钻井岩芯、测井、录井资料分析,结合薄片鉴定、阴极发光、X衍射、同位素及微量元素分析等分析手段,对呵叻盆地二叠系碳酸盐岩沉积相发育特征及沉积模式进行了系统分析。研究表明,呵叻盆地二叠系Pha Nok Khao组发育缓坡型无障壁碳酸盐台地沉积,研究区位于碳酸盐台地前缘斜坡部位,以海水浪基面为界,可划分为台地前缘浅水斜坡亚相及较深水斜坡亚相。浅水斜坡亚相指示沉积环境为位于浪基面以下或附近、水动力弱、弱还原—弱氧化的台地前缘斜坡环境;较深水斜坡亚相组合指示沉积环境为位于浪基面以下、水体较深、水动力弱、弱还原—中等还原的前缘斜坡环境。整体来看,研究区二叠系碳酸盐岩沉积时期主要为水体较深、水动力弱、垂向上沉积环境稳定的低能环境沉积。该沉积环境不利于形成良好的基质孔隙条件,有利储层发育主要取决于碳酸盐岩地层后期改造程度。
[Abstract]:Through the analysis of drilling core, logging and logging data in the study area, combined with thin slice identification, cathodoluminescence X-ray diffraction, isotope and trace element analysis, etc. The sedimentary facies development characteristics and sedimentary models of Permian carbonate rocks in Kulak basin are systematically analyzed. The results show that the Pha Nok Khao formation of Permian in Kulat basin develops gentle slope type unobstructed carbonate platform deposition. The study area is located at the front slope of carbonate platform, with the sea wave base as the boundary, and can be divided into subfacies of shallow slope and subfacies of deeper slope in front of platform. The subfacies of shallow slope indicates that the sedimentary environment is below or near the surface of wave. Hydrodynamic, weak reduction-weak oxidation front slope environment; Deepwater slope subfacies assemblage indicates that the sedimentary environment is below the surface of the wave, the water body is deeper, the hydrodynamic is weak, and the weak reduction-moderate reduction is the front slope environment. The sedimentary period of Permian carbonate rocks in the study area is mainly composed of low energy deposits with deep water body, weak hydrodynamic force and stable vertical sedimentary environment, which is not conducive to the formation of good matrix pore conditions. The development of favorable reservoir mainly depends on the degree of the later reformation of carbonate strata.
【作者单位】：陕西延长石油(集团)有限责任公司研究院;西安石油大学地球科学与工程学院;陕西延长石油国际勘探开发工程有限公司;
【基金】：陕西延长石油(集团)有限责任公司科技研发项目(ycsy2014ky-A-10)~~
【分类号】：P618.13

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