| Author's Name: ZHANG Benjian1, HAO Yi2,3, ZHOU Gang1, HE Yuan1, FU Xiaodong2,3, ZHANG Xihua1,
YANG Dailin1, XIN Yongguang2,3, ZHANG Zili1, ZHANG Chi1, PAN Liyin2,3, ZHU Kedan2,3 |
| Institution: 1. Research Institute of Exploration and Development，PetroChina Southwest Oil & Gas Field Company; 2. PetroChina Hangzhou Research Institute of Geology；3. Key Laboratory of Carbonate Reservoirs, CNPC |
| Abstract: |
| Marine carbonates have played a crucial role in the over 70-year natural gas exploration history of the Sichuan
Basin, and will remain a primary target field for natural gas exploration and development for a long time to come. Based
on the study of tectonic and lithofaies paleogeographic evolution of the entire marine strata, a systematic analysis of the
macro-control factors and the influencing factors of the reservoirs of different formations has been conducted in order to
explicitly define the distribution and exploration directions of large scale high-quality marine carbonate reservoirs in the
Sichuan Basin. The study concludes that: (1) The marine strata of Sichuan Basin has undergone four major tectonic cycles,
with 13 significant tectonic movements. Of these, two tension-dominated movements created the paleogeographic pattern
of the trough-platform alternation, while eleven uplift-dominated movements governed the sedimentary characteristics of
the large platform/ramp. (2) The conventional marine carbonate reservoirs in the Sichuan Basin can be simply divided into
two main types: sedimentary facies-controlled reservoir and karst reservoir. The development of high-quality reservoirs is
macroscopically controlled by tectonic processes, mainly distributed in the inclined areas of ancient uplifts and the
geomorphic high zone on both sides of the ancient rifts. (3) Six potential areas for large-scale exploration of carbonate
rocks in the future in the Sichuan Basin are proposed: the platform-margin zone of the Dengying Formation on the west
side of the Deyang-Anyue rift trough, the dolomitization shoal of the Lower Paleozoic on the east edge of paleo-uplift in
the central Sichuan Basin, the multi-layered platform-margin zone of the Upper Paleozoic on the west side of the Sichuan
Basin, the dolomitization shoal of the lower part of the lower second member of Maokou Formation in XuanhanWanzhou area of the eastern Sichuan Basin, the dolomitization shoal of the third member of Maokou Formation in
Yilong-Quxian area of the eastern Sichuan Basin, and reef-shoal limestones of the Changxing Formation along and
within the Pengxi-Wusheng intra-platform sag. |
| Keywords: marine strata; carbonate rocks; large scale high-quality reservoirs; exploration directions; Sichuan Basin |
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投稿时间：
2025-11-10 |
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