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Reconstruction of the Upper Ordovician palaeogeography and reservoir prediction in Yanchang exploration area, Ordos Basin

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Authors:Han Minqiang; Pu Renhai; Liu Haijuan; Guo Xiangdong; Liu Baoping
Author Affiliations:Primary:
Aerophotogrammetry and Remote Sensing Bureau(CNACG), Remote Sensing Application Institute, Xi'an, China
Other:
Northwest University, China
Yanchang Petroleum Group, China
Volume Title:Shiyou yu Tianranqi Dizhi Oil & Gas Geology
Source:Shiyou yu Tianranqi Dizhi = Oil & Gas Geology, 32(5), p.760-767. Publisher: Zhongquo Dizhi Xuehui, Shiyou Dizhi Zhuanye Weiyuanhui, Dizhi Pucha Kantan Zhu, Beijing, China. ISSN: 0253-9985
Publication Date:2011
Note:In Chinese with English summary. 15 refs.; illus., incl. 1 table, sects.
Summary:Major breakthroughs have been achieved in gas exploration in the Ordovician Majiagou Formation in Yanchang exploration area. These discoveries show that the development and distribution of gas-bearing layers have a close relationship with the furrow erosion palaeogeomorphology on top of the Ordovician. By using such techniques such as fine subdivision and correlation of the Majiagou Formation, thickness mapping of the Benxi Formation on the unconformity, forward modeling-based identification of eroded furrows on seismic section, and seismic inversion, we mapped the paleogeology of the pre-Upper Paleozoic and recognized two NW-SE trending eroded furrows on top of the Ordovician. The comprehensive analysis of the paleogeomorphogloic map and wave impedance map shows that the distribution of favorable reservoirs with low wave impedance in the Ordovician is consistent with the locations of erosion furrows and the eroded slopes on both sides. Moreover, it is also consistent with the locations of wells that produce gas from the Ordovician and that have favorable oil/gas shows. The research indicates that favorable reservoirs occur near Y112 well in Ganquan area, Y113-Y101 wells in the northwest of the study area and Y118-Y119-Y108 wells in central of the study area. These areas should be the major target areas for further exploration of the Ordovieian.
Subjects:Benxi Formation; Carbonate rocks; Carboniferous; Erosional unconformities; Lithostratigraphy; Majiagou Formation; Oil and gas fields; Ordovician; Paleogeography; Paleozoic; Petroleum; Petroleum exploration; Prediction; Reconstruction; Reservoir rocks; Sedimentary rocks; Unconformities; Asia; China; Far East; Gansu China; Ordos Basin; Yanchang Field
Coordinates:N360806 N360806 E1075409 E1075409
Record ID:710921-15
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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