华北古生代克拉通盆地南部原生油气藏勘探前景

doi:10.11743/ogg20050517

Abstract

Abstract:

According to analyses of the features and hydrocarbon generation history of Paleozoic source rocks,the Lower Paleozoic marine source rocks in North China are basically poor source rocks to non-source rocks due to their low organic matter abundance,though they have good kerogen type and large thickness;moreover,later burial history and thermal evolution history of source rocks are complex after the source rocks getting mature.Therefore exploration risk is high when taking them as the source rocks of a petroleum system.The Lower Paleozoic source rocks have medium to poor hydrocarbon generation potentials only in the southern part of Bohai Bay.After deeply buried in Himalayan,the Lower Paleozoic would be in condition to secondary hydrocarbon generation in Jiyang depression,Linqing depression,Dongpu sag and Huangkou sag,thus certain exploration potentials exist in these areas.The Upper Paleozoic Carboniferous-Permian source rocks are mainly coal measure strata,with thickness in the range of 150～500m,low to medium organic matter abundance,and type Ⅲ kerogen.Secondary hydrocarbon generation in Upper Paleozoic source rocks had occurred mainly at the end of Late Triassic and the end of Early Cretaceous,and hydrocarbons were well preserved,thus there would be large potentials for exploration of primary oil and gas reservoirs.The Upper Paleozoic favorable exploration areas are mainly in the Tertiary sags with large secondary gas generation intensity,such as Dongpu sag,Linnan sag,the southern part of Dezhou sag and the northern part of Xinxian sag in Bohai Bay basin.

Key words: primary oil and gas reservoirs, thermal evolution of organic matter, secondary hydrocarbon generation, Paleozoic, hydrocarbon potential, craton

CLC Number:

TE112.1

Zhang Zhongmin, Long Shengxiang, Xu Huazheng. Prospects of exploring Palaeozoic primary oil and gas pools in southern area of North China cratonic basin[J]. Oil & Gas Geology, 2005, 26(5): 661-667.

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Prospects of exploring Palaeozoic primary oil and gas pools in southern area of North China cratonic basin

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