下二门油田核二段沉积微相粒度概率累积曲线

Characteristics of probability cumulative curves of granularity in sedimentary
microfacies at the second member of Hetaoyuan Formation

李祺 陈振林 汤济广

中国地质大学资源学院，湖北 武汉 430074 长江大学地球科学学院，湖北 荆州 434023

在岩心观测的基础上，利用主要取心井的粒度分析资料，系统总结了下二门油田核二段三角洲前缘—浊积体沉积不同微相的粒度概率累积曲线特征：水上分流河道微相为典型的两段式、一跳一悬加过渡式、复杂三段式和高斜多跳一悬加过渡；河口坝为高斜多跳一悬式、高斜一跳一悬加过渡和高斜两段式；远砂坝为两段式；前缘席状砂为高斜两段式和一跳一悬加过渡式；浊积体沉积为“宽缓上拱”式、“低斜多段”式和低斜一段式。

Based on observation of cores and by using the granularity analysis data from main coring wells,the probability cumulative curves of granularity in different microfacies were systematically summarized for the turbidite sedimentary on the 2nd member of Hetaoyuan Formation in Xia’ermen Oilfield in the delta front. The researches show that the microfacies of distributary channel in the delta front are of typical bi-segment pattern, one bouncing-one suspension plus a transitional pattern,complicated trisegments pattern and steep multi bouncing-one suspension plus transitional pattern; that of river mouth bars are of steep multibouncing- one suspension pattern, steep one bouncing-one suspension plus transitional pattern and steep bi-segment pattern; that of the distal bar are of bi-segment pattern; that of front sheet sand are of steep bi-segment pattern and two bouncing-one suspension plus transitional pattern; and that of the fluxoturbidite sedimentary are of broad and gradually arched pattern, gentle slope multi-segments pattern and gentle slope bi-segment pattern.