Tectonic Feature and Hydrocarbon Accumulation of Jinxian1-1 Oil Field at Liaozhong Sag in Liaodongwan Depression

XIAO Jin-quan，LI Kun，HU He-wei，ZHANG Qing-lu

doi:10.11764/j.issn.1672-1926.2014.03.333

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 3: 333 - 340

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.03.333

Tectonic Feature and Hydrocarbon Accumulation of Jinxian1-1 Oil Field at Liaozhong Sag in Liaodongwan Depression

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1.The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering of
Chengdu University of Technology,Chengdu 610059,China;
2.CNOOC China Ltd.Tianjin,Tianjin 300452,China;
3.Henan Oilfield Company,Nanyang 474780,China

Received date: 2013-05-25

Revised date: 2013-06-16

Online published: 2014-03-10

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Abstract

Based on the 3D seismic profiles,tectonic feature of Jinxian1-1 oil field at Liaozhong Sag was investigated.On this basis,combined with the physical and chemical characteristics of the oil and gas at hydrocarbon reservoirs,the hydrocarbon accumulation process was analyzed and the hydrocarbon accumulation mode was established.There are several results as follows:(1)Liaozhong-1 fault runs through Liaozhong Sag,which forms strike-slip structural transfer zone.The transfer zone has the characteristics of strike-slip duplex on the plane.Manifestations of Liaozhong-1 fault vary in different parts of the district.(2)Traps in the area had already formed before source rocks generated a large number of hydrocarbons.(3)The MemberⅠof Dongying Formation was subjected to uplift and erosion,and then the activity of faults was enhanced and surface water seeped into underground rock stratum,as a result,oil that was migrated into traps at the early stage suffered biological degradation.Owing to composition fractionations of natural gas during the migration,gas dryness coefficient in the east block of the oil field is bigger than that in the west and the dryness coefficient of shallow gas is bigger than that of the deep.

Key words： Structural transfer zone; Hydrocarbon accumulation; Jinxian1-1 Oilfield; Liaozhong Sag; Liaodongwan Depression

Cite this article

XIAO Jin-quan，LI Kun，HU He-wei，ZHANG Qing-lu . Tectonic Feature and Hydrocarbon Accumulation of Jinxian1-1 Oil Field at Liaozhong Sag in Liaodongwan Depression[J]. Natural Gas Geoscience, 2014 , 25(3) : 333 -340 . DOI: 10.11764/j.issn.1672-1926.2014.03.333

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