FAULT MESH PETROLEUM PLAYS IN THE DONGHETANG AREA, TABEI UPLIFT, TARIM BASIN, NW CHINA, AND THEIR SIGNIFICANCE
Q. Liu, H. Xu, Z. Lei, Z. Li, Y. Xiong, S. Li, B. Luo, D. Chen
1Department of Geoscience, China University of Petroleum, Beijing, China
2Institution of Petroleum Exploration and Development of SW Tarim Basin, Tarim Oilfield Company, PetroChina, Korla, China
3Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology, East China University of Technology, Nanchang, China
4Jiangxi Engineering Technology Research Center of Nuclear Geoscience Data Science and System, East China University of Technology, Nanchang, China
5Research Institution of Petroleum Exploration and Development, Zhongyuan Oilfield Company, Sinopec, Puyang, China
Keywords: Allogenic and far source accumulation, fault mesh petroleum plays, multiple accumulation and adjustment, Tabei Uplift, Tarim Basin, NW China
Abstract
The hydrocarbon formation mechanism and potential targets in clastic strata from the Tabei Uplift, Tarim Basin, are documented using the fault mesh petroleum plays theory, based on integrating seismic, well log, well core and geochemistry data. The reservoirs in the Donghetang area are typical allochthonous and far source fault mesh petroleum plays. There are two sets of fault meshes in the study area: (1) the Donghe sandstone and combination of Permian and Triassic strata and (2) combination of the JIV and JIII formations in the Jurassic strata. The fault mesh petroleum play in the Jurassic is a secondary reservoir that originates from the Carboniferous Donghe sandstone reservoir adjustment based on source correlation. The fault mesh carrier systems are divided into four styles according to the fault mesh architecture: (1) fully connected, (2) fault-unconformity-transient storage relay, (3) fault-transient storage-unconformity relay, and (4) transient storage-fault relay. According to the characteristics of the fault mesh petroleum plays, the reservoirs are of 15 types and form three categories: upper transient storage, inner transient storage, and margin-transient storage. Integrated analysis of the hydrocarbon generation and faulting time periods reveals that there were four periods of hydrocarbon charging, with the first three stages charging the reservoirs with oil and the last stage charging the reservoirs with gas. There are multiple stages of reservoir accumulation and adjustment in the fault mesh in the study area. These multiple stages of fault mesh accumulation and adjustment are the main reason that the multiple vertical units of the reservoirs have different hydrocarbon properties. Fault-block reservoirs and lithologic reservoirs related to the inner transient storage and upper transient storage styles are the main exploration targets in the clastic strata in the study area.
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