Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 131-141.doi: 10.12108/yxyqc.20220312

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

A/S control on spatiotemporal evolution of deltas in rifted lacustrine basin and its numerical simulation： A case study of Paleogene Wenchang Formation in Lufeng 22 subsag，Pearl River Mouth Basin

ZHANG Wei1,2, LI Lei1,2, QIU Xinwei3, GONG Guangchuan1,2, CHENG Linyan1,2, GAO Yifan1,2, YANG Zhipeng1,2, YANG Lei4   

  1. 1. School of Earth Sciences and Engineering, Xi' an Shiyou University, Xi' an 710065, China;
    2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi' an 710065, China;
    3. Shenzhen Branch of CNOOC China Limited, Shenzhen 518000, China;
    4. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062550, Hebei, China
  • Received:2021-08-13 Revised:2021-10-21 Online:2022-05-01 Published:2022-05-12

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Abstract: The ratio of accommodation to sediment supply（A/S）of lacustrine basin shows a strong correlation with sequence structure and the stacking pattern of deltas on profile. By using high-resolution 3D seismic data and logging data，based on sequence stratigraphy，sedimentology theory and sedimentary numerical simulation technology，the isochronous stratigraphic framework of Paleogene Wenchang Formation in Lufeng 22 subsag of Pearl River Mouth Basin was established. Combined with sedimentary numerical simulation technology，the control effects of A/S on the spatiotemporal evolution of deltas in rifted lacustrine basin were explored. The results show that： （1）Wenchang Formation in Lufeng 22 subsag can be divided into six third-order sequences，including SQ1，SQ2，SQ3，SQ4 and SQ5+6 from bottom to top. Four types of delta systems are identified in Wenchang Formation in the study area，including chaotic foreset，downlap foreset，oblique foreset and imbricated foreset. （2）There are obvious differences between SQ3 and SQ4 sequence sedimentary systems of Wenchang Formation. During the SQ3 period，the A/S was greater than 1，sediments deposited in the lacustrine basin deltas mostly came from near-source，and large area of semi-deep to deep lacustrine deposits were developed in the subsag. During the SQ4 period，the A/S was less than or equal to 1，the delta advanced into the center of the lacustrine basin， and shore shallow lacustrine deposits were widely developed in the subsag.（3）The SQ3 and SQ4 sequences of Wenchang Formation in the study area were selected to carry out numerical simulation of delta sedimentary system. During the simulation，three main parameters such as accommodation，sediment supply and transportation patterns were set in the software. The simulation results are consistent with the actual geological understanding，and the spatial distribution of sand bodies in the study area was determined.

Key words: accommodation, sediment supply, delta in rifted lacustrine basin, numerical simulation, Wenchang Formation, Paleogene, Lufeng 22 subsag, Pearl River Mouth Basin

CLC Number: 

  • TE122.2
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