
第38卷第1期 2017年2月
文章编号:1001-3873(2017)01-0001-06
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI:10.7657/XJPG20170101
Vol.38,No.1 Feb.2017
玛湖凹陷西斜坡百口泉组砂砾岩储集层特征及
物性控制因素翟建华,张磊,吴俊,尤新才
(中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000)
摘要:准噶尔盐地玛湖凹陷西斜拨百口泉组为扇三角洲砂砾岩沉积,火成岩岩属含量高,储集层之间物性差异大,一直以来制约油气勘探。综合运用岩心观察、薄片鉴定等对百口泉组储集层特征及其控制因素进行研究,对玛湖凹陷西斜坡百口来组砂砾岩储集层进行了重新分类及命名,结合研究区岩心粒度分布特征,在GB/T17412.2一1998(岩石分类和命名方案沉积若岩石分类和命名方案》的基础上,将中砾岩进一步划分为小中殊岩及大中砾岩,在此基础
上明确了研究区砂砾岩粒度适中、黏粘土矿物含量较低及次生溶蚀发育是形成优质储集层的关键。关键调:准噶尔盆地;玛湖凹陷;西斜坡;下三叠统;百口泉组;砂砾岩;物性控制因素
中图分类号:TE112.23
文献标识码:A
Characteristicsof SandyConglomerateReservoirsandControllingFactorsonPhysical PropertiesofBaikouquanFormationintheWesternSlopeof MahuSag,JunggarBasin
QUJianhua,ZHANGLei,WU Jun,YOUXincai
(Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China)
Abstract: Baikouquan formation in the western slope of Mahu sag, Junggar basin is a set of fan-delta sandy conglomerate depositions. High content of igneous rock debris and the big diferences among physical properties of reservoir sections always constrain the petroleum explo ration in the area. The reservoir characteristics of Baikouquan formation and the controlling factors are studied based on core observation and thin section identification, and the sandy conglomerate reservoirs of Baikouquan formation in the westermn slope of Mahu sag are re-clas-sified and denominated. Combined with the grain size distribution of cores in the study area and based on the standard CB/T 17412.2 1998 Rock Classification and Naming Scheme: Sedimentary Rock Classification and Naming Scheme, pebble conglomerate is further divid-ed into fine pebble conglomerate and coarse pebble conglomerate. Based on which, moderate grain size of sandy conglomerate, relatively low content of clay minerals and secondary corrosion are considered as the key factors for high-quality reservoir formation.
Keywords: Junggar basin; Mahu sag; westem slope; Lower Triassic; Baikouquan formation; sandy conglomerate; physical property control
ling factor
准噶尔盆地玛湖凹陷西斜坡下三叠统百口泉组砂砾岩勘探自20世纪80年代开始,先后在西斜坡发现M2井区和M6井区油藏,由于砂砾岩储集层组分多样、分选差、物性差等特征以及对砂砾岩认识程度不够,斜坡区砂砾岩油气勘探进展缓慢"-。随着地质认识的不断深化以及勘探工程技术的进步,西斜坡百口泉组砂砾岩油气勘探逐渐获得突破,发现多个整装规模储量区,针对砂砾岩的研究逐渐增加。文献[3]和文献[4]证实了沉积相对储集层物性及成藏的影响;文献[5]进一步把砂砾岩岩相划分为9种砾岩相,证实不同岩相对储集层物性的影响;文献[6]一文献[8] 从古构造坡折方面证实了砂体受古构造的影响。对影响百口泉组砂砾岩储集层物性的控制因素一直未
收稿日期:2016-10-01
修订日期:2016-11-22
进行深人研究,目前的认识仅停留在用相带划分储集层物性阶段,而对于相同相带储集层物性存在的明显差异,尚未有清晰的解释。因此,本文通过大量岩心观察、薄片及物性资料,对玛湖凹陷西斜坡百口泉组砂砾岩储集层进行综合研究,确定影响砂砾岩储集层物性的主要因素,以期对砂砾岩研究区油气勘探有所神益。
区域概况 1
玛湖凹陷西斜坡位于准噶尔盆地玛湖凹陷的西部(图1),西侧和北侧分别为克百断裂带和乌夏断裂带,东侧和南侧分别为夏盐凸起和达巴松凸起。二叠纪至侏罗纪早期,玛湖凹陷一直是盆地的沉降中心之
基金项目:国家科技重大专项(2016ZX05001-005.2016ZX05003-005)
作者简介:晨建华(1981-).男,湖北洪湖人,高级T.程师,硕士,石油地质.(Tel)13689964163(E-mail)qujianh@petrochina.com.cn 万方数据