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四川盆地上震旦统灯影组四段典型碳酸盐岩 类型及沉积模式
Typical Carbonate Rock Types and Sedimentary Models of the 4th Member of the Sinian Dengying Formation in the Sichuan Basin
陈艺娴1 廖明光1 王文之2 李堃宇2 李亚丁2
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作者单位:1. 西南石油大学地球科学与技术学院 2. 中国石油西南油气田公司勘探开发研究院
中文关键字:沉积模式 岩石类型 碳酸盐岩 能量指数 灯影组 晚霞旦世
英文关键字:Sedimentary model; Rock type; Carbonate rock; Energy index; Dengying Formation; Sinian
中文摘要:    四川盆地上震旦统灯影组碳酸盐岩十分发育,但通过检索发现前人对灯影组碳酸盐岩的划分研究较少。以mx105 井为例,参考钻井岩心、薄片等资料,通过岩心描述、铸体薄片鉴定、成像测井分析等方法对上震旦统灯影组四段碳酸盐岩建立岩
心识别模板,对研究区沉积特征及沉积模式进行分析和研究。研究结果表明:①结合Folk 及张荫本对碳酸盐岩岩石类型划分方法,通过对mx105 井灯四段(5 300 ~ 5 370 m)岩心及薄片进行研究分析,将灯影组四段碳酸盐岩分为颗粒岩、晶粒岩及藻云岩3 大类,再根据其特征细分为7 小类即:凝块状云岩、砂屑云岩、粉晶云岩、泥晶云岩、纹层状云岩、叠层状云岩及黏结状云岩;②灯影组主要呈浅水型局限台地相沉积,而研究区灯影组四段主要发育藻丘亚相和颗粒滩亚相;③制定灯影组四段沉积模式图,得出灯影组沉积模式属于潮控型,沉积物的分异作用主要受潮汐作用影响,而非浪控;④潮控型模式最典型的特征是“水浅低能”,由于水动力弱,因此岩石的分选性差,其结构成熟度低,故研究区凝块状云岩十分发育。
英文摘要:    Carbonate rocks in the Sinian Dengying Formation in the Sichuan Basin are very well developed, but there are few studies on the classification of the Dengying Formation carbonate rocks. Taking Well mx105 as an example, with reference to drilling cores, thin slices and other data, a core identification template was established for the carbonate rocks in the fourth member of the Sinian Dengying Formation through methods such as core description, casting thin slice identification, and imaging logging analysis, and the study area was deposited Analysis and research on characteristics and depositional patterns. The research results show that: ① Combining the basis of Folk and Zhang Yinben's classification method of carbonate rock types, by studying and analyzing the cores and thin slices of the fourth member of Dengying Formation (5 300-5 370 m) in Well mx105, the carbonate rocks of the fourth member of Dengying Formation are analyzed. Divided into 3 categories of granular rock, crystalline rock and algae dolomite, and then subdivided into 7 sub-categories according to their characteristics and analyze corresponding characteristics; ② Combining petrological characteristics and imaging logging data analysis, Dengying Formation is mainly shallow water type Platform facies deposition is limited, and the fourth member of the Dengying Formation in the study area mainly develops algal mound subfacies and grain beach subfacies; ③ The deposition pattern of the fourth member of the Dengying Formation is drawn up, and it is concluded that the sedimentary model of the Dengying Formation belongs to the tidal control type. Abnormal effects are mainly affected by tidal action, not wave control. ④The most typical feature of the tide-controlled model is "shallow water and low energy". Because of the weak hydrodynamic force, the rocks have poor sortability and low structural maturity, so clot-like dolomites are well developed in the study area.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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