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扒楼沟剖面二叠系辫状河砂体构型与非均质性特征
王越,陈世悦,李天宝,梁绘媛,王剑
0
(中国石油大学地球科学与技术学院,山东青岛 266580;中国石化胜利油田分公司,山东东营 257015;新疆油田公司实验检测研究院,新疆克拉玛依 834000)
摘要:
通过露头实测、精细解剖与岩相分析等方法,结合岩石薄片与物性资料,对山西保德扒楼沟剖面二叠系山西组辫状河砂体的构型与非均质性特征进行系统研究。结果表明:辫状河主要发育河道和心滩2种成因砂体,河道砂体的垂向岩相组合为Ge-St,心滩砂体的垂向岩相组合为Ge-Sm-M-Sm-Sp-M-Sp或Ge-Sm-St-Sm-St-Sp-M-Sp;辫状河砂体可划分为5级构型单元,由小到大分别是层系、层系组、心滩/河道增生单元、心滩/辫状河道、单期河道,河道砂体由多个增生单元在垂向上加积构成,心滩砂体由多个增生单元与串沟砂体在垂向上加积构成,内部发育泥质夹层;心滩砂体物性优于河道砂体,非均质性相对较弱,整体可以作为优质储层,而河道砂体仅在靠近河心的部位物性较好,可作为优质储层;心滩砂体内规模较大的泥质夹层附近和河道砂体的边部及中上部可聚集剩余油,且心滩砂体内剩余油储量相对河道砂体较大。
关键词:  扒楼沟剖面  辫状河  河道  心滩  砂体构型  非均质性  剩余油分布
DOI:10.3969/j.issn.1673-5005.2016.06.001
投稿时间:2016-06-05
基金项目:“十二五”国家油气重大专项(2011ZX05013-002)
Braided river sand body architecture and heterogeneity of Permian in Palougou outcrop
WANG Yue,CHEN Shiyue,LI Tianbao,LIANG Huiyuan,WANG Jian
(School of Geosciences in China University of Petroleum, Qingdao 266580, China;Shengli Oilfield, SINOPEC, Dongying 257015, China;Experimental Testing Institute of Xinjiang Oilfield, Karamay 834000, China)
Abstract:
Through field measurement, sand body anatomy, lithofacies analysis, and with the aid of thin sections and physical data, the architecture and heterogeneity characteristics of the braided river sand bodies of Shanxi Formation of Permian in the Palougou profile in Baode county, Shanxi province, were systematically studied. The results show that two kinds of genetic sand bodies, channel and channel bar are mainly developed in braided rivers. The vertical lithofacies combinations in channel sand body and channel bar sand body are Ge-St and Ge-Sm-M-Sm-Sp-M-Sp or Ge-Sm-St-Sm-St-Sp-M-Sp, respectively; Braided river sand bodies can be further divided into five levels of architectural elements, which are bed, bed set, channel bar/channel accretion, channel bar/braided channel, and braided river from small to large. Channel sand body is usually composed of several accretions superimposed vertically, while channel bar sand body is composed of several accretions and chute sand bodies superimposed vertically, with mud layers in it. Channel bar sand body has better physical properties and weaker heterogeneity than channel sand body, and therefore, the whole channel bar can be high quality reservoir. On the other hand, channel sand body only has good physical properties near the river center which may become potential reservoir. Remaining oil mainly accumulates near large scales of mud layers in the channel bar, and in the side and upper part of the channel sand body, but with large deposition potentials in the channel bar.
Key words:  Palougou profile  braided river  channel  channel bar  sand body architecture  heterogeneity  remaining oil distribution
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