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- Title
鄂尔多斯盆地陇东地区长7 段重力流砂体构型及其 主控因素.
- Authors
梁晓伟; 鲜本忠; 冯胜斌; 陈鹏; 尤源; 吴千然; 淡卫东; 张文淼
- Abstract
The Chang 7 member in the Longdong area of the Ordos Basin contains huge gravity-flow sandbodies and rich oil and gas resources. However, their shape, scale and superpositional relationships differ considerably in different strata regions, and very little is known about their architecture and development. This restricts the improvement of their oil and gas rolling exploration and development efficiency. A study based on core analysis, on the architectural division and the development characteristics of the sandbodies was carried out based on the identification of individual well sandbody architecture interface and their comparison at regionally connected wells, together with sandbody sedimentary facies analysis. The study suggests that the scale of gravity-flow sandbodies in this area is relatively large. The main provenance is a south-southwestern system, followed by a northeastern provenance system. The sandbodies are characterized as a typical lacustrine channel-fan system subdivided into seven sedimentary microfacies; erosional channel, transitional channel, sedimentary channel, levee, channelized lobe, tabular lobe and turbidite sheet sand. The thickness of the sandbody increases from the delta front slope to the deep-lake depocenter, and its shape changes from a strip to a fan. In addition, the architectural properties change (e.g., the scale). The vertical superpositional relationships and the lateral migration aspects of the sandbodies also show regular changes in the planar view. In the nearshore semi-deep lake delta front slope area individual sandbodies are relatively thin, and the isolated strips occur as thinly interbedded or single layers. The thickness of the single sand layer increases towards the center of the basin, and the lateral connectivity is enhanced. Superimposition of the bodies has led to an increase in vertical connectivity and a transition to continuous stacking. The thickness of individual sandbodies is slightly reduced near the depocenter, but the lateral connectivity is significantly enhanced with obvious continuity, evident as an interval-stacking type of deposition. Comprehensive analysis suggests that the configuration of the gravity-flow sandbodies in this area is controlled by gravity-flow sedimentary facies, base-level cyclic changes and provenance supply rate.
- Publication
Acta Sedimentologica Sinica, 2022, Vol 40, Issue 3, p641
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000⁃0550.2021.017