Characteristic of Overpressure and Its Control on Migration and Accumulation Model for Hydrocarbon Reservoirs below Source Rocks in Rangzijing Slope Zone of Southern Songliao Basin

LI Dan，DONG Chun-mei，LIN Cheng-yan，REN Li-hua，TAN Li-juan，XIE Jing-jing

doi:10.11764/j.issn.1672-1926.2014.03.326

2014 , Vol. 25 >Issue 3: 326 - 332

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.03.326

Characteristic of Overpressure and Its Control on Migration and Accumulation Model for Hydrocarbon Reservoirs below Source Rocks in Rangzijing Slope Zone of Southern Songliao Basin

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1.School of Geosciences in China University of petroleum,Qingdao 266580,China;
2.Shandong Key Laboratory of Reservoir Geology in China University of petroleum,Qingdao 266580,China

Received date: 2013-05-17

Revised date: 2013-06-16

Online published: 2014-03-10

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Abstract

The distribution of overpressure is analyzed for Qingshankou Formation from Rangzijing Slope Zone in southern Songliao Basin.The hydrocarbon migration and accumulation models of reservoirs below the source rocks controlled by the overpressure are studied.The results show “three low and one high” that the overpressure zone is characterized by low seismic velocity,low density,low resistivity and high acoustic travel time.The well pressure is a “three-layered” structure vertically.The depth of overpressure strata varies in different secondary structural zone,which suggests the feature of “strata-controlled”.The main range of overpressure is 10 to 14MPa,which is calculated by the equivalent depth method.There exists a positive correlation between the distribution of overpressure and the depth.The coupling of oil source,overpressure and Tfaults make it possible to migrate downward 272 to 510m theoretically,deeper than the Fuyu oil thickness.The match of overpressure and conduit system under the source rocks leads to vertical evolution of 4 migration patterns.There is a positive correlation between the thickness of hydrocarbon shows in the reservoir and the overpressure of the source rocks.The existence of “dominant pressure leakage compartment” results in shorter down-migration distance which is mainly within 100m in fact,and the down-migration distance varies with the change of “dominant pressure leakage compartment” location.Overall,the Ⅱ and Ⅲ sand groups are the preferable layer which is filled with hydrocarbon in Fuyu oil layer.

Key words： Distribution of overpressure; Migration and accumulation models; Hydrocarbon reservoirs below source rocks; Dominant pressure leakage compartment; Qingshankou Formation; Rangzijing slope zone

Cite this article

LI Dan，DONG Chun-mei，LIN Cheng-yan，REN Li-hua，TAN Li-juan，XIE Jing-jing . Characteristic of Overpressure and Its Control on Migration and Accumulation Model for Hydrocarbon Reservoirs below Source Rocks in Rangzijing Slope Zone of Southern Songliao Basin[J]. Natural Gas Geoscience, 2014 , 25(3) : 326 -332 . DOI: 10.11764/j.issn.1672-1926.2014.03.326

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