鄂尔多斯盆地镇泾地区中生代地层剥蚀厚度估算及古构造恢复

doi:10.3969/j.issn.1673-8926.2016.02.010

Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 72-80.doi: 10.3969/j.issn.1673-8926.2016.02.010

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Estimation of denudation thickness of Mesozoic strata and paleostructure restoration in Zhenjing area, Ordos Basin

Li Chao¹,Zhang Liqiang¹,Zhang Likuan²,Wang Peng³,Hu Caizhi⁴,Zhang Haisen³

1. School of Geoscience ， China University of Petroleum ， Qingdao 266580 ， Shandong ， China ； 2. Institute of Geology and Geophysics ， Chinese Academy of Science ， Beijing 100029 ， China ； 3. No. 10 Oil Production Plant ， PetroChina Changqing Oilfield Company ， Qingyang 745600 ， Gansu ， China ； 4. Sinopec Research Institute of Exploration & Production ， Beijing 100083 ， China

Online:2016-03-20 Published:2016-03-20

Abstract

Abstract:

The Mesozoic and the overlain strata in Zhenjing area underwent four stages of formation uplift and denudation events corresponding to the unconformity surfaces of Jurassic-Triassic, Jurassic Yanan Formation-Zhiluo Formation, Jurassic-Cretaceous and Cretaceous-Quaternary. Compaction curve extrapolation method and formation tendency correlation method were used to estimate the denudation thickness resulted by the four stages of tectonic uplift events from Triassic, and the denudation thicknesses from different stages were compared. Basin numerical modeling method was applied to restore the structural evolution process of the top surface of Chang 8 oil reservoir set. The result shows that the strata denudation thickness of the end of Triassic Yanchang Formation is 345-465 m, the strata denudation thickness of the end of Middle Jurassic Yan’an Formation changes from 150 m to 220 m, and the strata denudation thickness of the end of Jurassic Anding Formation is 160-250 m. However, the denudation thickness of the end of Late Cretaceous-Neogene Zhidan group is much more than that of the other three stages, and it varies from 980 m to 1 280 m. The structural form of Yanchang Formation in the study area was controlled by tectonic subsidence and uplift and denudation, with tilting structural evolution process from Triassic.

Key words: low porosity and low permeability , rock petrophysical analysis , frequency dividing attribute technique of advantage trace , curve reconstruction , prestack inversion , Pearl River Mouth Basin

Li Chao,Zhang Liqiang,Zhang Likuan,Wang Peng,Hu Caizhi,Zhang Haisen. Estimation of denudation thickness of Mesozoic strata and paleostructure restoration in Zhenjing area, Ordos Basin[J].Lithologic Reservoirs, 2016, 28(2): 72-80.

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