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福山凹陷流一段沉积时期,主要以辫状河三角洲沉积为主,同时在半深湖—深湖区发育重力流沉积。以A、B井为例,根据岩心测井资料,对重力流发育特征进行剖析,结合该区的构造特征和沉积背景建立了福山凹陷流一段的重力流沉积平面展布与沉积模式。根据单井相分析识别出该研究区的重力流沉积为远端湖底扇沉积,并分为碎屑流沉积和浊流沉积2种类型。总体垂向上由下至上发育着湖底扇—辫状河三角洲前缘—辫状河三角洲平原的沉积演化序列。该研究将为福山凹陷岩性油气藏的进一步寻找和评价提供依据。
During the first depositional period of the Fukuya Sag, sedimentation mainly occurs in the braided river delta, while gravitational-current sedimentation is developed in the semi-deep lacustrine-deep lacustrine zone. Taking wells A and B as an example, the development features of gravity flow are analyzed according to core logging data. Based on the tectonic characteristics and sedimentary background of the area, a gravity flow depositional plane distribution and deposition model in the first section of the Fukuya Depression is established. Based on single-well facies analysis, it is identified that the gravity flow deposition in the study area is the remote sublacustrine fan and is divided into two types: debris flow deposition and turbidity flow deposition. The sedimentary evolution sequence of the sublacustrine fan-braided river delta front-braided delta plain was developed vertically from bottom to top. This study will provide the basis for further searching and evaluation of lithologic reservoirs in Fukuyama Sag.