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- Title
鄂尔多斯盆地延安西部地区马五<sub>1+2</sub>亚段正向低幅度构造成因及油气地质意义.
- Authors
冯林杰; 蒋裕强; 武富礼; 武渝; 梁德民
- Abstract
In order to find out the genesis of low-amplitude structure in Ma51+2 sub-member in western Yan'an and its relationship with oil and gas enrichment, based on the fine identification of current low amplitude structure by trend surface analysis, this study carried out the comparison between paleogeomorphology and current structure, and preliminarily discussed the genesis and petroleum geological significance of positive low-amplitude structures in combination with drilling, logging, gas testing and cast thin section data. The results show that: (1) A total of 10 positive low-amplitude structures are developed on the top of Ma51+2 sub-member in this area, mainly in the form of nose uplift, and the structural axis has three trends: Near east-west, near northeast-southwest and near northwest-southeast; (2) The positive low-amplitude structure under the current west dipping monocline background is mainly inherited and evolved from the high parts of pre-Carboniferous karst paleogeomorphology; (3) There is a certain coupling between the positive low-amplitude structure and the distribution of high-quality reservoirs in the limestone deficient area of Ma6 Member; (4) The development of positive low-amplitude structures is conducive to the formation of structural-lithologic traps and has an obvious control over the enrichment of natural gas.
- Subjects
PETROLEUM industry; SURFACE analysis; TREND analysis; KARST; SURFACE structure; NATURAL gas
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p944
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.006