Sedimentary environments and sandbody distribution in member 2 of Permian Shanxi formation in mid-eastern Ordos Basin
YANG Wei1,2, WANG Feng1
1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
2. Engineering Investigation and Design Institute, Sichuan Provincial Coalfield Bureau, Chengdu 610072, China
Abstract:The member 2 of Lower Permian Shanxi formation is a main gas-producing reservoir and an important layer for exploration in the mid-eastern Ordos Basin. Outcrop analysis, core observation, comprehensive logging data interpretation and geochemical analysis suggest that the study area was affected by Marine facies at the early-middle stage of member 2 of Shanxi formation. It developed a rivertide controlled delta at the 2 and 3 sub-member of member 2 of Shanxi formation. The delta plain included distributary channel, abandoned channel, peat swamps and interdistributary depression. The delta front included sedimentary micro-facies, such as underwater distributary channel, mouth bar, distal bar, tide sand dam, and interdistributary bay. Seawater pushed out along the southeast Ordos Basin in the age of the 1 sub-member of member 2 of Shanxi formation. The study area developed a river controlled-lake delta on the background of terrestrial lakes. The differences of ancient geographical conditions lead to the different types of sand and reservoir properties. The reservoir sand in the 3 sub-member of member 2 of Shanxi formation was changed by the marine facies completely in the Mizhi-Zizhou and Tawan-Gaoqiao area. It has more advantages in lithologic characteristics, sand thickness and reservoir performance, which are favorable for gas exploration.
阳伟, 王峰. 鄂尔多斯盆地中东部二叠系山西组2段沉积环境及砂体展布[J]. 科技导报, 2016, 34(2): 110-115.
YANG Wei, WANG Feng. Sedimentary environments and sandbody distribution in member 2 of Permian Shanxi formation in mid-eastern Ordos Basin. Science & Technology Review, 2016, 34(2): 110-115.
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