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- Title
珠江口盆地白云凹陷裂陷期沉积环境演化 与控烃作用.
- Authors
谢世文; 柳保军; 庞 雄; 丁 琳; 吴宇翔; 刘冬青; 王宇辰
- Abstract
Two sets of source rocks, Wenchang Formation and Enping Formation, were developed in Baiyun Sag of the Pearl River Mouth Basin during the rifting period. Through 3D seismic data and deep drilling analysis, it is believed that axial braided river delta system, fault controlled fan delta system, braided river delta system in the north gentle slope zone and shore shallow lake medium deep lake system in the basin are developed during the rifting period of Baiyun Main Depression. In the early stage of rifting, many groups of NE trending fault terraces are developed and the landform is characterized by many ups and depressions. The provenance mainly enters the depression from the east to the west, forming multi-point source water systems and developing multi depressions to generate hydrocarbons; In the middle of rifting, due to the extension of detachment faults, the lake basin expanded, and the Panyu low uplift in the north was strongly uplifted, forming a large delta system and a large lake basin with gentle slopes; In the late rifting period, the lake basin was dominated by depression, and coal type and transgressive source rocks were developed under the influence of South China provenance and transgression from south to north. According to sedimentary facies and geochemical indicators, the source rocks in Baiyun Sag can be divided into three types: Type I-II1 source rocks of middle-deep lacustrine facies in Wenchang Formation, Type II2 source rocks of shallow lacustrine facies in Wenchang Formation and Types II2-III source rocks of shallow lacustrine facies in Enping Formation. The hydrocarbon generation potential of different types of source rocks is different, and the middle-deep lacustrine facies source rocks in Wenchang Formation are the best. The element geochemical indicators reveal that the overall hydrocarbon generating environment of the lake basin belongs to freshwater to brackish water, reducing to strong reducing water environment, while the paleontology reveals that the oil generating parent material of the lake basin is Huxiang planktonic algae and terrestrial plants, and the organic matter of high-quality hydrocarbon source rocks mainly comes from planktonic algae. In a word, the detachment fault activity and sedimentary system of Baiyun Sag control the development thickness and scale of hydrocarbon source rock, and the high-quality water environment controls the formation of high-quality hydrocarbon source rock. Therefore, the source rocks in Baiyun Sag have geological conditions of large thickness and wide distribution, and have great resources and exploration potential.
- Subjects
FACIES; WATERSHEDS; BRAIDED rivers; PALEONTOLOGY; BRACKISH waters; RIFTS (Geology); SUBMARINE fans; SAPROPEL
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 2, p296
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.09.003