珠江口盆地白云凹陷储层沥青成因及其对油藏调整改造的启示

doi:10.11743/ogg20190113

Abstract

Abstract:

Reservoir bitumen has been discovered in multiple Paleogene series of strata in the Baiyun Sag,Pearl River Mouth Basin.The abundance of reservoir bitumen gradually increases from the shallower Zhuhai and Zhujiang formations to deeply buried Enping and Wenchang Formations.The reservoir bitumen only sporadically occurs in coarse-grained sandstones with better permeability and porosity, while occurs in siltstones and mudstones in the form of veins.Almost all reservoir bitumen samples do not show apparent anisotropy with bitumen reflectance lower than 2.0%,suggesting that the reservoir bitumen in the Baiyun Sag doesn't mainly result from high-temperature cracking.All bitumen extracts lack 25-norhopane series according to the analysis of molecular geochemical composition.No gas chromatogram base-line "hump" was discovered in all saturated hydrocarbon of reservoir bitumen.The reconstructed burial history of representative individual wells shows that the reservoir strata have not experienced large-scale uplifting and denudation.Therefore,the reservoir bitumen in the Baiyun Sag is not of biodegradation origin.Based on the analyses of the geological setting and characteristics of oil and gas reservoirs,the origin of reservoir bitumen could be attributed to later "gas washing" for deeply buried hydrocarbon-accumulation generated by source rocks of Enping and Wenchang Formations during the early thermal maturity stage.The time differences of thermal evolution for source rocks and reservoirs of various stratigraphic horizons leads to the adjustment and altering of oil and gas reservoirs in the Baiyun Sag,subsequently resulting in the formation of light and volatile oil reservoirs.

Key words: bitumen reflectance, cracking, gas washing, reservoir bitumen, Baiyun Sag, Peral River Mouth Basin

CLC Number:

TE135

Li Meijun, Zhang Zhongtao, Chen Cong, Yang Chengyu, Lu Xiaolin, Fu Jian, Dai Jinhui, Tang Youjun. Origin of reservoir bitumen and its implications for adjustment and reformation of hydrocarbon-accumulation in Baiyuan Sag, Pearl River Mouth Basin[J]. Oil & Gas Geology, 2019, 40(1): 133-141.

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Origin of reservoir bitumen and its implications for adjustment and reformation of hydrocarbon-accumulation in Baiyuan Sag, Pearl River Mouth Basin

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