Segments of the platform margin of Lianglitage Formation,Upper Ordovician in Tabei Uplift,Tarim Basin and its geological significance
MA Debo1,2, LI Honghui1, CUI Wenjuan3, LI Tingting1, ZHU Wenping4
1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China; 2. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China; 3. National Geological Library of China, Beijing 100083, China; 4. Exploration & Development Institute, Tarim Oil Field Company, PetroChina, Korla, Xinjiang 841000, China
Abstract：Carbonate platform margin types play an important role in reservoir formation and oil and gas productivity.Based on newly acquired 3D seismic data and the latest drilling data,first we obtain the distribution of Lianglitage platform margins with platform margin strata thickness variations,and calculate different platform margin types with strata slopes in the study area.Then we analyze the control of margin types on reservoir development and oil and gas accumulation.The following under-standings are obtained:①In Lianglitage platformmargin,strata become obviously thicker,the Tabei palaeo-uplift is banded near EW surrounding with about 240 km long from east to west and 10~20 km wide from north to south,the total area is about 2600km2; ②Based on the stratigraphic slope variation in platform margin,the Lianglitag platform margin shows as different margin types along the east-west direction and has certain segments.The western part located in Yingmaili-Halahatang-Tuoputai area is weak rimmed carbonate platform margin with steep margin slope (1° to 3°).Seismic response of the platform margin is a cuneate reflection thinning to the basin.The eastern part located in eastern Tahe-Lungudong-Yuqi area is ramp type platform margin with gentle margin slope (0.2° to 1°); On seismic sections,the platform margin is shown as a trough gradually tapering to disappear to the basin.③The segments of the Lianglitage platform margin resulted in the reservoir difference in these two parts.Reservoirs in the western part are thick and good quality,but with large lateral variation.Reservoirs in the eastern are part thin and poor quality,but with wide distribution.The segmentation of Lianglitage platform margin has important significance for selecting favorable exploration area in Tabei.
马德波, 李洪辉, 崔文娟, 李婷婷, 朱文平. 塔北地区上奥陶统良里塔格组台缘带分段性及石油地质意义[J]. 石油地球物理勘探, 2019, 54(1): 198-207.
MA Debo, LI Honghui, CUI Wenjuan, LI Tingting, ZHU Wenping. Segments of the platform margin of Lianglitage Formation,Upper Ordovician in Tabei Uplift,Tarim Basin and its geological significance. Oil Geophysical Prospecting, 2019, 54(1): 198-207.
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