Hydrocarbon Accumulation Prospect and Charge History of the Northern Monocline Belt in Kuqa Depression of Tarim Basin,Western China

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;
    3.Key Laboratory of Basin Structure and Hydrocarbon Accumulation,CNPC,Beijing 100083,China

Received date: 2015-02-12

  Revised date: 2015-03-29

  Online published: 2015-12-10

Abstract

The lowest exploration level tectonic belt of Kuqa Depression is the Northern Monocline Belt.A detailed study was done to unravel the charge history of northern Monocline Belt in Kuqa Depression based on the techniques of fluid inclusion,quantitative grain fluorescence and laser Raman.By combining the characteristic of the source rock,reservoir,seal and trap we can make an evaluation of the petroleum exploration prospective play.According to the porous sand reservoir and fractured reservoir core sample analysis,the fluid inclusions in porous sand reservoir samples are single phase(liquid oil)with yellow fluorescence,the QGF index in the reservoir is generally greater than 6,QGF-E intensity is greater than 20pc,showing obvious inherited characteristic of the hydrocarbon charging,while two-phase(vapor and liquid oil)and three-phase(solid bitumen,liquid oil and vapor)fluid inclusions with blue-white fluorescence are dominant in the fractured reservoir samples and the QGF index,QGF-E intensity and R1 show outliers in them.It is concluded that the northern Monocline Belt had experienced hydrocarbon charge in three different stages.In the first stage(about 65Ma),the porous sand reservoir is charged by the immature oil,after that the study area experienced Himalayan orogeny which made the stratum fold strongly and formed a large numbers of fractures which connected other reservoirs or source rock,leading to the charge of light oil in the second stage(about 10Ma).In the third stage(about 3Ma),the fractured reservoir was flushed by the gas.The source rock,reservoir and seal in the study area match well in the vertical.Source rock has entered the stage of generating light oil,some zones even entered the stage of generating condensate or dry gas nowadays.The development of “sweet point” was controlled by fractures in the tight reservoirs in the tight reservoirs which is promising for the petroleum exploration in the northern Monocline Belt.

Cite this article

WU Hai,ZHAO Meng-jun,ZHUO Qin-gong,LU Xue-song . Hydrocarbon Accumulation Prospect and Charge History of the Northern Monocline Belt in Kuqa Depression of Tarim Basin,Western China[J]. Natural Gas Geoscience, 2015 , 26(12) : 2325 -2335 . DOI: 10.11764/j.issn.1672-1926.2015.12.2325

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