Deepwater Bottom Current Rework Sand (BCRS) in Lacustrine Basins:Sedimentary Characteristics,Identification Criterion,Formation Mechanismand Its Significance for Unconventional Oil/Gas Exploration

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    (1.Northwest Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China;
    2.Key Laboratory of Reservoir Description,CNPS,Lanzhou 730020,China;
    3.Research Institute of Petroleum Exploration and Development,Jilin Oilfield,Songyuan 138001,China;
    4.Research Institute of Petroleum Exploration and Development,Daqing Oilfield,Daqing 163000,China)

Received date: 2013-12-11

  Revised date: 2014-01-20

  Online published: 2014-10-10

Abstract

Bottom current rework sand (BCRS) of deep water is the most important reservoir in marine basins.Compared with marine basins,whether the large scale BCRS was developed in the deep water area of continental lacustrine basins or not,and its sedimentary characteristics,identification criterion,formation mechanism,distribution,external morphology,differences with deep water gravity sandbody,and its value in oil/gas exploration are the important issues worth exploration.Based on core,seismic data,laboratory analysis and satellite photos of Qinghai Lake,the above issues have been discussed in this paper.BCRS of continental lacustrine basins was composed of muddy siltstone-fine sandstone and siltstone-fine sandstone,where the thickness of single layer was 0.5-280cm.Cross bedding,parallel bedding,lenticular bedding,and starvation bedding were well developed.BCRS has four basic features which include fine-grain interbedded with lacustrine black shale,sedimentary structure formed by tractive current,and interacted with gravity flow.The results show that delta front and deep water gravity sandbodies reworked by wind-driven bottom current is the main reason for the development of deep water BCRS.Significant differences can be found between deep water BCRS and deep water gravity sandbodies in sedimentary characteristics,distribution direction,mechanism,and etc.BCRS were widely distributed in deep water area of continental lacustrine basins.Tight oil/gas reservoir can be developed in thick BCRS.The abroad distribution of BCRS can improve the content of brittle minerals in muddy shale.The distribution area of BCRS can be “sweet points” for oil/gas exploration in shale.The study results of this paper played an important role in expanding the unconventional oil/gas exploration in continental basins of China.
 

Cite this article

PAN Shu-xin,CHEN Bin-tao,LIU Hua-qing,LI Xiang-bo,ZHAO Zhan-yin,LIN Tie-feng,ZHANG Qing-shi . Deepwater Bottom Current Rework Sand (BCRS) in Lacustrine Basins:Sedimentary Characteristics,Identification Criterion,Formation Mechanismand Its Significance for Unconventional Oil/Gas Exploration[J]. Natural Gas Geoscience, 2014 , 25(10) : 1577 -1585 . DOI: 10.11764/j.issn.1672-1926.2014.10.1577

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