Theory and Methods of Lithological Reservoir Exploration in Qibei Slope of Qikou Sag

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  • (1.China University of Petroleum,Beijing 102249,China; 2.Dagang Oilfield Company of CNPC,Tianjin 300280,China;
    3.Bureau of Geophysical Prospecting Inc.,Tianjin 300280,China; 4.Antonoil Oilfield Services Limited,Beijing 102249,China)

Received date: 2014-01-01

  Revised date: 2014-03-11

  Online published: 2014-10-10

Abstract

Qikou Sag is one of the most important hydrocarbon rich sags in the Bohai Bay Basin with landscape of more depression and few uplift,and various kinds of slopes.With the constant improvement of exploration,the slope area is an important object of exploration.Taking Qibei slope as an example,the controlling mechanisms of regional tectonic framework,distribution of sandbodies and reservoir have been discussed intensively by the study of Qibei slope.Three points can be generalized as following:(1)The difference on basement subsidence controls the formation of the slope and the fractured bedrock controls the development style of the slope.(2)The within and outside sources supply sand,regulation of the groove conveys sand and the steep or gentle slope controls sand.(3)The duplicate migration,two recharging,oil higher than gas,the differential accumulation and concentration of favorable facies control the formation of oil and gas reservoir.Then we innovate and develop the hydrocarbon accumulation theory and establish the exploration techniques of the lithostratigraphy reservoir in the sag enriched in oil and gas:Choosing slope-establishing model-seeking breakthrough-tracing sand body-optimizing schemas.The result has effectively directed the pre-exploration of the lithostratigraphy reservoir in the slope area of the Dagang Oilfield and discovered sizable reserves.

 

Cite this article

DONG Yue-qi,LI Hong-xiang,WANG Li,LIU Xue-chao,WANG Xiu-ping,LI Ning . Theory and Methods of Lithological Reservoir Exploration in Qibei Slope of Qikou Sag[J]. Natural Gas Geoscience, 2014 , 25(10) : 1630 -1636 . DOI: 10.11764/j.issn.1672-1926.2014.10.1630

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