川中高石梯-磨溪地区震旦系灯影组碳酸盐岩岩石类型及分布规律

发布时间：2018-05-09 09:31

  本文选题：川中 + 震旦系　； 参考：《岩石学报》2017年04期

【摘要】：四川盆地川中地区震旦系气藏储量规模大,储层分布面积广。在Folk(1959)碳酸盐岩分类方案与张荫本等(1996)对粘结岩分类方案研究的基础之上,结合四川盆地震旦系灯影组的具体情况,提出新的划分方案。研究表明:(1)高石梯-磨溪地区震旦系灯影组碳酸盐岩岩石类型可分为3个亚类,10个微类。该方案不同之处在于把凝块(石)云岩归位颗粒岩,同时根据藻的形态把藻云岩进一步细分;(2)沉积岩类的发育和分布受沉积层序的控制。海侵体系域(TST)沉积阶段,以泥-粉晶云岩、微生物岩等正化学岩沉积为主。高位体系域(HST)沉积阶段,以凝块云岩、砂屑云岩等异化颗粒岩沉积为主。纵向上,岩性具有从暗色泥晶云岩→藻云岩→颗粒云岩→浅色泥晶云岩演化的特征,即泻湖亚相→藻丘亚相→颗粒滩亚相→台坪亚相的规律;(3)凝块云岩、砂屑云岩等颗粒岩是主要的储集岩类;(4)灯影组碳酸盐岩不同岩类的发育和分布对储层的发育起到控制作用。对灯影组的油气勘探,除了对岩溶作用的研究之外,还需要重视沉积古地貌、岩相展布特征的分析,有助于有效的预测灯影组储层"甜点区"。
[Abstract]:The Sinian gas reservoir in Sichuan Basin has a large scale of reserves and a wide distribution area. On the basis of the study on the classification scheme of carbonate rocks of Folkian 1959 and Zhang Yimen et al. 1996), a new classification scheme is put forward according to the concrete situation of the Dengying formation of Sinian system in Sichuan Basin. The study shows that the carbonate rock types of the Dengying formation of the Sinian system in Gaoshiti-Moxi area can be divided into 3 subclasses and 10 microclasses. The difference of this scheme is that the condensate (stone) dolomite is integrated into granular rock, and the development and distribution of algal dolomite are further subdivided according to the algae morphology. The development and distribution of sedimentary rocks are controlled by the sedimentary sequence. In the transgressive system tracts (TST) sedimentary stage, the main deposits are mud-powdery dolomite, microbial rocks and other orthochemical rocks. In the high system tract (HST) sedimentary stage, the main sedimentary types are condensed dolomite, sandclastic dolomite and other dissimilated granular rocks. Longitudinally, the lithology is characterized by the evolution from dark mudstone to algal dolomite and grained dolomite, that is, lagoon subfacies, algal phylla subfacies, granular shoal subfacies and subfacies of Taiping subfacies, I. e., condensed dolomite. The development and distribution of carbonate rocks in Dengying formation play a controlling role in reservoir development. In addition to the study of karstification, the analysis of sedimentary paleogeomorphology and lithofacies distribution should be paid more attention to in the exploration of oil and gas in Dengying formation, which is helpful to effectively predict the "dessert area" of Dengying formation reservoir.
【作者单位】： 中国石油勘探开发研究院;中石油西南油气田分公司勘探开发研究院;中国石油西南油气田分公司;
【基金】：国家科技重大专项(2016ZX05007004) 中国石油天然气股份有限公司重大勘探专项(2014E-3208(GF))联合资助
【分类号】：P534.31;P618.13

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