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Relationship Between Pre-Jurassic Palaeogeomorphology and Oil Distribution of Zhenjing Oilfield in South Ordos Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2008年第04期
Page:
385-
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Relationship Between Pre-Jurassic Palaeogeomorphology and Oil Distribution of Zhenjing Oilfield in South Ordos Basin
Author(s):
DING Xiao-qi; ZHANG Shao-nan; LIU Yan
State Key Laboratory o f Oil and Gas Reservoir Geology and Exploitation, Chengdu University o f Technology, Chengdu 610059, Sichuan, China)
Keywords:
Zhenjing oilfield;  method of mold;  palaeogeomorphology;  compacting efficiency
PACS:
TE121.3
DOI:
-
Abstract:
Pre-Jurassic palaeogeomorphology of Zhenjing oilfield has been mapped by mold method according to well cores, cast liquid photos and petrophysical data, as well as interpretation of well logs. Based on analysis of palaeogeomorphology, it is found that the distribution of sedimentary facies of Yan 9 formation was controlled by pre-Jurassic palaeogeomorphology, braid channels flew out the valley from highland with gentle slopes, and some distributaries of braid channels in the north part came to braid channel in the south.The structures of Yan 9 were formed by differential compaction. Highland and ridge could formed comparative high angle anticline easily. The petrophysics of Chang 6 formation under the denudation plane were controlled by leaching degree, that is to say, reservoir has better petrophysics if it experienced strong leaching through which the products of alteration were discharged easily. The degree of leaching and discharge of alteration products were controlled by palaeomorphology, thus, valley had most leaching zones.The Yan 9 reservoir over the denudation plane were controlled by structures and sandstones, and oils distributed in highland and ridge. However, the Chang 6 reservoir under the denudation plane were controlled by degree of leaching, and oils distributed in valley.

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Last Update: 2008-12-20