摘要
为研究鄂尔多斯盆地东南部岩溶古地貌发育特征及储集空间分布规律,依据岩心、测井、露头、地震、分析化验等资料,采用古地质图法、残余厚度法、印模法、地球物理属性法等方法进行综合分析,得出鄂尔多斯盆地东南部奥陶系岩溶古地貌形态为:“西与西南为高地,高中可见鞍与台,台间洼地汇流水,水流沿坡向东流,坡中形成丘与台,丘台间有若干沟,沟沟相汇进入盆,盆中可见洼与丘”。研究认为,岩溶斜坡中残丘、岩溶高地与岩溶台地转换部位、古沟槽两侧上倾方向的斜坡带岩溶作用强烈,溶蚀孔隙发育。由于受后期压实、胶结、交代、溶蚀等成岩作用影响,原生孔隙保留很少,储层储集空间以纳米级晶间孔为主,其次为微米级的溶蚀孔。根据岩溶古地貌与古沟槽网络分布规律及储层储集空间分布特征,认为古沟槽控制的斜坡带及残丘区、岩溶高地的地貌单元转换带是勘探开发的重点区域。
In order to study the development characteristics of karst paleogeomorphology and spatial distribution pattern of reservoir in the southeastern Ordos Basin,based on the data of cores,well loggings,outcrops,seismic data,and laboratory test,several methods,such as paleogeological map,residual thickness,impression and geophysical attribute,are used for comprehensive analysis.Results show that the karst paleogeomorphology of Ordovician in the southeastern Ordos Basin is as follows:“The west and the southwest areas are highlands,where saddles and platforms are developed.Water funnel into sags between platforms and flow eastward along the slope.Mounds and platforms are formed in the slope,between which there are several grooves.Waters in the grooves finally funnel into the basin.There are sags and mounds in the basin.”The study shows that,in residual mounds,karst highlands and transition parts of karst platforms in karst slope,as well as the slope zones of the up-dip parts of paleo-grooves,karstification is strong and dissolution pores are well developed.Due to the influence of later diagenesis such as compaction,cementation,metasomatism and dissolution,primary pores are rarely preserved.The reservoir space is mainly composed of nanometer-scale intercrystalline pores,followed by micro-scale dissolution pores.According to the distribution patterns of karst paleogeomorphology and paleo groove network and the spatial distribution characteristics of reservoir space,the slope zones and residual mound areas controlled by paleo grooves and the geomorphic transition belts in karst highlands are the key areas of hydrocarbon exploration and development.
作者
曹红霞
吴海燕
任星民
武渝
梁全胜
仝敏波
Cao Hongxia;Wu Haiyan;Ren Xingmin;Wu Yu;Liang Quansheng;Tong Minbo(Dali University;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.;Shaanxi Coal and Chemical Technology Institute Co.,Ltd)
出处
《中国石油勘探》
CAS
CSCD
北大核心
2020年第3期146-155,共10页
China Petroleum Exploration
基金
国家自然科学基金资助项目“鄂尔多斯盆地南缘三叠系延长组优质烃源岩中碳酸岩的发现及其成因研究”(41702117)
陕西省自然科学基金资助项目“基于分形理论的致密碳酸盐岩储层微纳米孔喉结构定量表征研究”(2017JQ4007)
陕西省自然科学基础研究计划资助项目“渭河盆地油气地质条件及勘探潜力研究”(2017JQ4018)。
关键词
碳酸盐岩
岩溶古地貌
储层研究
马家沟组
鄂尔多斯盆地东南部
carbonate rock
karst paleogeomorphology
reservoir study
Majiagou Formation
southeastern Ordos Basin
