A Study on the Sedimentary Environment and Facies Model of Triassic Carbonate Rocks in the Mangeshlak Basin
Source abstract
Abstract
Based on drilling, core and seismic data, combined with the regional tectonic sedimentary evolution background, the sedimentary environment of the Triassic carbonate rocks in the Mangeshlak Basin was studied. A sedimentary facies model of this set of carbonate rocks was established. Research has shown that the Mangeshlak Basin underwent a complete large-scale marine transgression–regression sedimentary evolution process during the Triassic. During the early to middle Triassic, seawater gradually invaded the northwest region of the basin from northwest to southeast and gradually regressed in the late Middle Triassic. In the lower part of the Triassic carbonate rocks, the primary components are developed granular limestone or dolomite with oolitic structures, interspersed with a small amount of thin mudstone, which is a good reservoir; the upper part of the Triassic is mainly composed of sedimentary mudstone and mudstone, which can form good sealings. The hill-shaped reflections of the platform edge facies, along with the high-frequency, strong-amplitude, and moderately continuous reflections within the restricted platform interior, are clearly visible on the seismic profile. These features are consistent with the sedimentary environment and lithofacies characteristics revealed by drilling data along the profile. Drilling and seismic data revealed that the sedimentary environment of the early and middle Triassic in the basin is mainly composed of shallow water platform edges and restricted platforms, as well as carbonate rock slopes and open non-marine shelves in deep water areas. A sedimentary facies model of the Triassic carbonate rock segment in the basin was established, comprising restricted platforms, platform edges, carbonate rock slopes, and non-marine shelves. Unlike the modified Wilson marginal carbonate rock platform model, the carbonate rock platform edge in the Mangeshlak Basin does not develop reef facies. Instead, it is mainly composed of oolitic beach (dam) sediments, making it the most favorable sedimentary facies zone for the Triassic reservoir development in the basin.
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Research context
OpenAlex topics: Hydrocarbon exploration and reservoir analysis · Geological formations and processes · Geological Studies and Exploration
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Oil and Gas Survey, China Geological Survey, Beijing 100083, China
State Key Laboratory of Continental Shale Oil, Beijing 100083, China
The Key Laboratory of Unconventional Petroleum Geology, China Geological Survey, Beijing 100083, China
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
Funding
Basic Science Foundation of Institute of Geomechanics · Geological Survey Project of China Geological Survey on International Cooperation in Oil and Gas Geological Survey of Key Global Areas · Global Oil and Gas Exploration Situation and Industrial Cooperation Research
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