Cenozoic giant coal-bearing basin belt discovered in China’s sea area

The South China Sea is rich in oil and gas resources. With the increasing exploration of oil and gas resources in the northern South China Sea and the increasing demand for energy in the world,The central-southern South China Sea have become important constituencies for oil and gas resources.The central-southern basins of South China Sea can be divided into three types of basin groups,namely,the southern basin group (Zengmu Basin, Brunei-Sabah Basin),the western basin group (Wan'an Basin, Zhong jiannan Basin) and the Central Basin Group (Liyue Basin, Beikang Basin, Nanweixi Basin and Palawan Basin).At present,the degree of exploration is relatively low, and the source rock has not yet formed a understanding of the system. The main source rock development time, source rock characteristics, hydrocarbon generation potential and control factors of each basin group are still unclear, which seriously restricts the exploration of oil and gas. Based on the sedimentary facies distribution and sedimentary filling evolution, combined with the geoche mical characteristics of the source rocks, the source age, organic matter type, hydrocarbon generation potential and main controlling factors of the basins in the central-southern basins are discussed. By the detailed research on delta scale, provenance system, paleoclimate conditions, ancient vegetation development and hydroca rbon generation parent material, the main controlling factors of hydrocarbon generation potential of source rocks in each basin group are revealed. The main source rocks of the western basin group are the Oligocene-Lower Miocene, which develop the lacustrine facies, the marine-continental transitional facies and the marine source rocks, mainly the marinecontinental transitional facies and marine source rocks,the lacustrine source rocks are only distributed in the Lower Oligocene of Wan'an Basin and the Oligocene

Characteristics, differences and main controlling factors of source rocks in the central‐southern South China Sea Basins

Having surveyed a large number of previous studies,this paper evaluated source rocks in the east Balingian depression of the Zengmu Basin by looking into abundance,type and maturity of their organic matters,and discussed contributions of these source rocks by comparing the characteristics of biomarkers in the crude oil and in the source rock of the east Balingian depression.The study showed that source rocks of the east Balingian depression mainly are the Oligocene carbonaceous mudstone,coal,marine shale and the Lower-Moderate Miocene marine mudstone and coal;the source rocks have large thickness and good hydrocarbon generating conditions,and distribute widely in the depress.In addition,the biomarker's characteristics in the oil from Patricia is very similar to those in the coal-measure source rocks.In summary,the east Balingian depression of the Zengmu basin has good exploration prospect.

Evaluation of Source Rocks and Oil-Source Correlation in East Balingian Depression of Zengmu Basin

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Evaluation of Source Rocks and Oil-Source Correlation in East Balingian Depression of Zengmu Basin