doi:10.16186/j.cnki.1673-9787.2019070012

Received:2019/07/02

Revised:2019/12/15

Published:2021/03/15

Reservoir characteristics and controlling factors of Baikouquan formation inHongcheguai area

JIA Chunming1, YAO Weijiang1, YU Haitao1, GUAN Jian1, KUANG Hao2, YU Jingwei3, YU Meiqi3, CHEN Kairui3

1.Exploration and Development Institute， PetroChina Xinjiang Oilfield Company， Urumchi  830014 ， Xinjiang， China;2.School of Petroleum Engineering ，Chongqing University of Science and Technology， Chongqing  401331 ， China;3.China University of Petroleum （ Beijing） at Karamay， Karamay  834000 ，Xinjiang， China

Abstract:Hongcheguai area is close to Mahu sag. Baikouquan formation in this area has great potential for oil and gas exploration， but the related characteristics of target reservoir are not well understood， which hinders further exploration. Through core observation， related rock slice analysis （ ordinary， fluorescence and casting）， scanning electron microscope ， physical properties and oil testing， etc. ， the petrological characteristics ， reservoir physical properties， pore structure and reservoir space of Baikouquan formation ware analyzed in detail. The results showed that rock types of Baikouquan formation in the study area were sandstone and conglomerate， the second member was composed mainly of medium rock-fragment conglomerate rock， while the third member was composed mainly of rock-fragment sandstone； The reservoir belonged to low porosity and ultra-low permeability ，and there was a positive correlation between the oil-bearing property and the physical property ； Pore structure of reservior in third member was better than that of the second member；The reservoir space was mainly primary intergranular pores， followed by secondary pores and micro fractures. Sedimentary micrefacies and rock fabric had large affection on favorable reservoir distribution of favorable reservoir and reservoir quality. Compaction was the basic factor of low reservoir physical property in diagenesis. Cement and sedimentary components provided material basis for later dissolution. The paleogeomorphology control was favorable for the plane distribution of reservoirs， and the abnormal pressure and micro fractures caused by strong compression were helpful to the improvement of reservoir physical properties.

Key words: reservoir characteristic; controlling factor; Baikouquan formation; Hongcheguai area; oil and gas exploration

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