玛18井区三叠系百口泉组沉积相精细研究及有利储层预测

玛18井区三叠系百口泉组发育一套近源粗粒碎屑沉积,目前关于该区的沉积相类型仍存在争议,生产矛盾突出。通过岩心观察,结合扫描电镜、岩石薄片、录井、测井及试油等资料对艾湖油田三叠系百口泉组(T1b)沉积相进行研究。研究表明,百口泉组(T1b)发育一套扇三角洲沉积,而非冲积扇沉积,也并非只发育扇三角洲水下沉积部分,可识别出扇三角洲平原、扇三角洲前缘、前三角洲3个亚相以及泥石流、扇面河道等9个微相。其中,牵引流成因的扇面河道和水下分流河道微相含油性较好,为有利储层;而泥石流、碎屑流等重力流成因的储层,含油性较差。本次研究将为该区后续的评价、开发提供新的思路和方法,也为邻区甚至国内其他扇三角洲发育区的油气勘探开发提供借鉴。

The Thorough Study of Sedimentary Facies and Favorable Reservoir Prediction of Triassic Baikouquan Formation in Ma 18 Well Block

The Triassic Baikouquan Formation of Ma 18 well block developed a set of near-source coarse-grained clastic sediment. AT present, the type of sedimentary facies is still controversial in this region, and the contradiction of production is project. Based on the observation of cores, and combining scanning electron microscope, thin slices, well logging, mud logging and west testing data, sedimentary facies of Triassic Baikouquan Formation were studied. The results show that sedimentary facies in Baikouquan Formation is fan delta, not alluvial fan or just only underwater deposition section of fan delta. The sedimentary facies can be divided into 3 subfacies of fan-delta plain, fan-delta front and frontal delta, and 9 corresponding microfacies, such as mud-rock flow and fan channel. Specifically, fan channel and underwater distributary channels belongs to traction current genesis, having better oil-bering properties than mud-rock flow and debris flow, generated to gravity flow.The study will provide new ideas and methods for the evaluation and follow-up development of this area, and provide references for oil exploration and development to near-area and oter fan deltas in China.