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Yang C.,Institute of Development Strategies for Marine Geosciences | Yao Y.,Institute of Development Strategies for Marine Geosciences | Li X.,Institute of Development Strategies for Marine Geosciences | Liao Z.,CAS Guangzhou Institute of Geochemistry
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2010

The present paper discussed the oil-generating potential of Cenozoic coal-measure source rocks in Zengmu Basin by means of organic geochemical, organopetrological and sedimentological investigations on typical source rock samples. Integrated with the examination of depositional facies, compositional and genetic analyses of macerals indicated that Lower Miocene coal-measure source rocks with exceptional generative potential in Zengmu Basin were deposited in a mangrove depositional environment of a low-delta plain. And quantitative analyses of maceral assemblages, conventional hydrocarbon-generating parameters and investigations on the thermal evolution of source rocks showed that this suite of source rocks was of exceptional potential in generating and expulsing hydrocarbons at the low-mature stage. In addition, a large number of microfissures connecting with each other were well developed due to the elevated inner pressure resulting from the formation of many exsudatinites within source rocks, which favored the convergence and expulsion of oil drops excreted from source rocks.


Yang C.-P.,Institute of Development Strategies for Marine Geosciences | Yao Y.-J.,Institute of Development Strategies for Marine Geosciences | Li X.-J.,Institute of Development Strategies for Marine Geosciences | Wan L.,Institute of Development Strategies for Marine Geosciences | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2011

Wan'an basin, as a typical Cenozoic transtensional basin, is one of the most important petroliferous basins in the southwestern of South China Sea. In this study, using seismic, drilling and some palaeontologic data, the Cenozoic sequence stratum pattern in Wan'an basin is established, which is subdivided into three super-sequences, six secondary sequences and ten tertiary sequences. In this sequence, the depositional process of Cenozoic strata in Wan'an basin is interpreted as gradually transgression based on comparative study of seismic and drilling data. SSQ1 and SSQ2 sequences are predominantly composed of lacustrine deposits during syn-rift. And SSQ3, SSQ4, SSQ5 as well as SSQ6 sequences are characterized by transitional facies and marine deposit. According to the interpretation of the lithofacies and sedimentary facies from typical seismic profiles, several kinds of lithostratigraphic traps are recognized and predicted, including basin floor fan, turbidite fan and colluvial mass in low-stand system tracts; upward wedge-out sands in transgressive system tracts; and delta sands and biohermal suite in high-stand system tracts.

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