A development rule of Lower Cambrian Longwangmiao grain beaches in the Sichuan Basin

被引：9

作者：

Zhou, Jingao ^{[1
]}

Fang, Chao ^{[2
]}

Ji, Hancheng ^{[2
]}

Zhang, Jianyong ^{[1
]}

Zhao, Fei ^{[2
]}

机构：

[1] Hangzhou Research Institute of Geology, PetroChina, Hangzhou, 310023, Zhejiang

[2] College of Geosciences, China University of Petroleum, Beijing

来源：

Natural Gas Industry | 2014年 / 34卷 / 08期

关键词：

Distribution rule; Early Cambrian; Grain beach; Longwangmiao Fm; Palaeogeomorphology; Sea level change; Sedimentary facies; Sichuan Basin;

D O I：

10.3787/j.issn.1000-0976.2014.08.005

中图分类号：

学科分类号：

摘要：

Great progress has been made through years of exploration in the Lower Cambrian Longwangmiao Fm in the Sichuan Basin. To learn more about the spatial and temporal distribution of grain beaches is significant to predicting the distribution of Longwangmiao Fm reservoirs. Therefore, according to the controlling factors of beach-body development, such as deposition palaeogeomorphology, sea level change, palaeobathymetry, etc., we conducted the research of vertical superimposed relationship and horizontal distribution rule of the Longwangmiao Fm grain beaches with 3 exploratory wells as study cases integrated with two field profile sections. The following findings were concluded. (1) Longwangmiao Fm sediments occurred in a gentle slope depositional environment, which are divided into the internal ramp facies, middle ramp facies and external ramp facies, and grain beaches are mainly developed in internal ramp facies and middle ramp facies. (2) The thickness of beaches is gradually becoming larger and the dolomite beaches are gradually being replaced by limestone beaches from the western to eastern parts of the Sichuan Basin. (3) On grain beaches are longitudinally developed dolarenite - dolomicrite - argillaceous dolomicrite, dolarenite - fine powder dolomite - argillaceous micritic dolomite, limestone powder - calcarenite - micritic dolomite - argillaceous micritic dolomite, oolitic limestone - micritic limestone lithological association. (4) On the transverse, grain beaches are in a zonal distribution along both sides of gypsic saline lakes, mainly deposited on the uplift area of gentle slopes, especially on the micro-landform highland of the uplift area with the beaches most developed.

引用

页码：27 / 36

页数：9

共 31 条

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