Wrench related faults and their control on the tectonics and Eocene sedimentation in the L13–L15 sub-sag area, Pearl River Mouth basin, China
Por:
Chen, Shuping, Xu, Shunshan, Cai, Yu, Ma, Xiaodan
Publicada:
1 sep 2018
Ahead of Print:
1 ene 2017
Resumen:
Recent oil discoveries in the L13–L15 sub-sag area in the Pearl River Mouth basin have inspired interest in Paleogene hydrocarbon targets. However, the structures and their control on reservoirs have not been completely studied. The aim of this paper is to address the tectonics and Eocene sedimentation based on 3D seismic data. We documented characteristics from four aspects of the faults in the study area: (a) fault arrangement; (b) fault segmentation; (c) flower structures; and (d) distribution of the depocenters along the faults. Based on the above data, we propose that the structures in the studied area were formed by a right-handed wrench. The principal shear for this model was caused by NNE- to NE-ward motion of the eastern part of the Eurasia plate due to the collision of the Indian–Australian and Eurasian plates starting approximately 49 Ma ago. The L13–L15 sub-sag area underwent early Eocene rifting, a late Eocene rifting-depression transition and an Oligocene-Quaternary thermal depression. The rift phase included three stages: the initial rifting, intensive rifting and late rifting. The deep lake mudstone deposited during the intensive rifting stage is the source rock with the most potential for oil generation. Shallow lake source rocks formed in the late rifting and transition stages are the secondary source rocks. Reservoir sweet spots were formed in the early period of the intensive rifting and late rifting stages. The junction sites between the front of the meandering river delta plain and fault steps are favorable places for good reservoirs. The sediments in the transition stage are rich in sandstone, making them perfect sites for prospecting reservoirs. © 2017, Springer Science+Business Media B.V.
Filiaciones:
Chen, Shuping:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
Xu, Shunshan:
Centro de Geociencias, Universidad Nacional Autónoma de México, Apartado Postal 1-742, Querétaro, Qro., Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Apartado Postal 1-742, Queretaro 76001, Qro, Mexico
Cai, Yu:
Daqing Oilfield Limited Corporation, PetroChina, Daqing, Heilongjiang, China
PetroChina, Daqing Oilfield Ltd Corp, Daqing 163513, Heilongjiang, Peoples R China
Ma, Xiaodan:
Tarim Oilfield Company, PetroChina, Korla, Xinjiang, China
PetroChina, Tarim Oilfield Co, Korla 841000, Xinjiang, Peoples R China
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