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| Types of the Cambrian platform margin mound-shoal complexes and their relationship with paleogeomorphology in Gucheng area, Tarim Basin, NW China |
| ZHANG Junlong1,2, HU Mingyi1, FENG Zihui2, LI Qiang2, HE Xiangxiang2, ZHANG Bin2, YAN Bo2, WEI Guoqi3, ZHU Guangyou3, ZHANG You4 |
1. School of Geosciences, Yangtze University, Wuhan 430100, China;
2. Exploration and Development Research Institute, Daqing Oil Field Company Ltd., Daqing 163712, China;
3. PetroChina Research Institute of Exploration and Development, Beijing 100083, China;
4. PetroChina Hangzhou Research Institute of Geology (HIPG), Hangzhou 310023, China |
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Abstract Based on the observation of outcrops and cores, thin section identification, restoration of paleogeomorphology by residual thickness method, fine description of seismic facies, etc, the coupling relationships between the development patterns of various types of Cambrian platform margin mound-shoal complexes and paleogeomorphology in the Gucheng area of Tarim Basin have been examined. The Cambrian platform margin mound shoal complex is divided into mound base, mound core, mound front, mound back and mound flat microfacies, which are composed of dolomites of seven textures with facies indication. The different paleogeomorphology before the deposition of mound-shoal complex in each period was reconstructed, and three types of mound shoal complex sedimentary models corresponding to the paleogeomorphologies of four stages were established: namely, the first stage of gentle slope symmetric accretion type, the second stage of steep slope asymmetric accretion type and the third and fourth stage of steep slope asymmetric progradation type. Their microfacies are respectively characterized by "mound base - mound back + (small) mound core + mound front - mound flat" symmetric vertical accretion structure, mound base - (large) mound core + mound front - mound flat "asymmetric vertical accretion structure, mound base - (small) mound core + mound front - mound flat" asymmetric lateral progradation structure. With most developed favorable reservoir facies belt, the steep slope asymmetric accretion type mound- hoal complex with the characteristics of "big mound and small shoal" is the exploration target for large-scale oil and gas reservoir.
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Received: 01 December 2019
Published: 16 September 2020
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ZHANG Junlong,HU Mingyi,FENG Zihui, et al. Types of the Cambrian platform margin mound-shoal complexes and their relationship with paleogeomorphology in Gucheng area, Tarim Basin, NW China[J]. Petroleum Exploration and Development, 0, (): 20201211-20201211.
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| http://www.cpedm.com/EN/ OR http://www.cpedm.com/EN/Y0/V/I/20201211 |
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