潍北凹陷孔三段火山岩储层控制因素分析及评价

Evaluation and Analysis of Reservoir Controlling Factors on the Volcanic Reservoir in Third Member of Kongdian Formation in the Weibei Sag

孔三段火山岩油藏逐步成为潍北凹陷的一个油气勘探亮点,储层物性是油气富集程度的关键因素。结合测井、录井及地震资料,通过岩心观察、薄片鉴定、测试资料分析等手段对孔三段火山岩储层的控制因素进行了深入分析,认为火山岩相、构造及风化淋滤作用是火山岩储层物性发育的关键影响因素。其中,火山岩相控制了气孔发育带,是储集空间演化的物质基础;构造作用形成裂缝,提高火山岩孔隙的连通性;风化淋滤作用形成风化带有利于油气的运移和聚集成藏。根据三个因素对储层的影响程度,建立了火山岩储层的三角形评价方法,将研究区火山岩储层分为四大类。该研究成果对孔三段火山岩储层的预测具有重要指导价值,其分类评价方法对相似地区的火山岩储层评价也具有较大的借鉴意义。

The volcanic rock oil reservoir of the third member in Kongdian Formation has become the new bright spot for oil and gas exploration in Weibei sag. The reservoir property is the key factors of hydrocarbon accumulation abundance of the reservoir. Through core observation, slice identification, combined with analysis of testing data, logging and seismic data, the main control factors on the volcanic reservoir of the third member in Kongdian Formation has been analyzed. It is believed that the physical property of reservoir is influenced mainly by the volcanic facies, eluviations and structures. The volcanic facies controlled the band of gas pore, being the material basis for the evolution of the space. The tectonism formed fractures, and it can improve the connectivity of primary pores. The weathering and leaching can form eluvial horizon which is beneficial to hydrocarbon migration and accumulation. Through anal- ysis of the three control factors on the reservoir, a triangle volcanic reservoir evaluation method has been established. The volcanic rock reservoirs in the study area are divided into four categories. The study results are significance in predicting volcanic reservoir in the area, and the classification evaluation method is also significant to volcanic reservoir evaluation in the similar areas.