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鄂尔多斯盆地里151油藏尚处于开发前期,储层沉积微相及砂体展布规律认识不清。为指导后续开发,结合岩心观察、薄片鉴定、测井及生产动态等资料进行了沉积微相划分,确定了微相空间展布规律及其与油气富集的关系。结果表明:延安组延8—延9油组为三角洲平原沉积,可进一步划分出分流河道、河道砂坝、决口扇和河间沼泽4种沉积微相;发育1~3条南西—北东向分流河道,随着基准面变化河道发生了横向摆动,不同时期分流河道的数量、规模也发生变化。延10油组为辫状河沉积,可划分出辫状河道、心滩和泛滥平原3种沉积微相;心滩发育,砂体厚度大。基准面下降晚期的延10-1、延9-2、延8-3和延8-1小层储层发育,有利于油气富集;分流河道、河道砂坝、辫状河心滩微相对油气富集有利。
The 151 reservoir in the Ordos Basin is still in the pre-development stage, and the reservoir sedimentary microfacies and sand body distribution laws are not well understood. In order to guide the follow-up development, sedimentary microfacies were classified according to core observation, sheet identification, well logging and production dynamics, and the relationship between the spatial distribution of microphase and its enrichment was confirmed. The results show that there are four sedimentary microfacies of distributary channel, channel sand bar, strobe fan and inter-river swamp in the Yan-Yan-Yan-9 oil group, which can be divided into delta plain sediments. There are 1 to 3 South West-North East As a result, the number of shunting rivers and the size of shunting rivers have also changed in different periods. Yan 10 oil group is a braided river sedimentary, which can be divided into three types of sedimentary microfacies: braided channel, heart beach and floodplain; heart and beach development, sand body thickness. The late 10-1, 9-2, 9-2, 8-1 and 8-1 reservoir development in late stage of basement decline is favorable for the enrichment of oil and gas; the distributary channel, channel sand dam and braided river hearth micro-relative Oil and gas enrichment is favorable.