塔河地区鹰山组高精度层序划分及沉积微相展布规律

doi:10.3969/j.issn.1673-8926.2016.06.010

Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 68-77.doi: 10.3969/j.issn.1673-8926.2016.06.010

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High-precision sequence division and sedimentary model of Yingshan Formation in Tahe area

Wei Duan^1，2， Gao Zhiqian ^1，2， Meng Miaomiao^1，2， Yang Xiaoqun^1，2， Wang Jingbin^1，2， Wang Shanshan^1，2

1. School of Energy Resources， China University of Geosciences （Beijing）， Beijing 100083， China； 2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism， Ministry of Education，China University of Geosciences （Beijing）， Beijing 100083， China

Received:2016-01-20 Revised:2016-03-06 Online:2016-11-10 Published:2016-11-10

Abstract

Abstract: The Yingshan Formation is of great scientific interest for being the significant replacing productive for-mation in Tahe Oilfield. However, the researches on high-precision sequence division and the sedimentary model are inadequate. Based on the thin sections, well logging and seismic data, the Yingshan Formation in Tahe area was divided into two third-order sequences （SQ1 and SQ2）, and it was further divided into four fourth-order sequencesthrough the identification of unconformity and stratigraphic stacking patterns. Seven microfacies （Mf1-Mf7） wererecognized and three microfacies assemblagses（MA1-MA3） were summarized, including platform interior interme-diate-high energy bank（MA1）, platform interior low energy bank and intrabank sea（MA2） and platform interior tidal flat （MA3）. Based on the microfacies analysis and correlated with wells, the sedimentary model of the Ying- shan Formation was analyzed. During the SQ1 period, it was restricted platform environment, and the MA1 and the MA3 developed. During the SQ2 period, it transferred to open platform gradually, the MA2 was the dominant microfacies assemblage. The closer to the platform margin, the more platform interior intermediate-high energy bank（MA1） developed.

Key words: stratigraphic structure section, nonmarine organic-rich formations, shale gas, tight oil and gas, Sichuan Basin

Wei Duan， Gao Zhiqian， Meng Miaomiao,Yang Xiaoqun， Wang Jingbin,Wang Shanshan. High-precision sequence division and sedimentary model of Yingshan Formation in Tahe area[J].Lithologic Reservoirs, 2016, 28(6): 68-77.

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