Z51井区长8油层组三角洲前缘微相组合及含油性

The Microfacies Combination and oiliness of Delta Front in Oil Bearing Layer Chang 8 in Z51 Well-block

以鄂尔多斯盆地南部Z51井区长8油层组为例,主要分析其三角洲前缘的微相组合类型及含油性。在三角洲前缘识别出:间互式水下分流河道、间互式河口坝及坝下河上三种微相组合类型。测井显示,间互式水下分流河道的含油性略好于间互式河口坝,间互式河口坝含油性好于坝下河上微相组合,坝下河上微相组合含油性较差。说明微相组合在一定程度上了控制该区长8储层的含油性,微相组合研究需要足够重视。

Taking the Chang 8 oil-bearing formation in the Z51 well area in the southern part of the Ordos Basin as an example,the micro-phase combination type and oil-bearing property of the delta front are mainly analyzed.At the delta front,three types of microfacies are identified：the inter-submerged subaqueous distributary channel,the inter-connected estuary dam and the dam under the river.The well shows that the oil content of the inter-submerged distributary channel is slightly better than that of the inter-type estuary dam.The oil content of the inter-type estuary dam is better than that of the upper dam,and the micro-phase combination on the river under the dam is poor.It is indicated that the micro-phase combination controls the oil-bearing property of the Chang 8 reservoir in a certain extent,and the micro-phase combination research needs to pay enough attention.