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综合应用岩心、录井、测井、地震等资料,以地震剖面的追踪和连井剖面对比为基础,通过井-震结合,分析研究区的主要目的层南屯组的层序地层和沉积体系、沉积相带等.通过阐明沉积体系类型和沉积相构成特征,揭示四级层序下沉积相的组合分布,对南屯组的有利沉积相类型进行统计分析.结果表明:南屯组地层是盆地断陷期的沉积充填,随着湖盆持续扩大,形成一套半深湖-深湖为主的地层层序,主要发育扇三角洲、辫状河三角洲、湖底扇、滨浅湖-深湖相沉积;南屯组一段主要岩性为灰色砂岩与深灰色粉砂质泥岩、泥岩互层,从下至上细分为3个四级层序,该沉积时期为区内第一次区域性大规模水进期,沉积厚度较大,区域明显受断裂构造控制,靠近同沉积断裂,可见明显的水进—水退旋回,主要物源方向为北西和北东方向.南屯组二段主要沉积一套灰色、绿灰色粉砂岩和泥质粉砂岩,局部夹有灰色、绿灰色砂砾岩、灰白色细砂岩和厚层灰黑色泥岩.从下至上细分为2个四级层序,主要物源方向为北东方向,次要物源方向为南西方向.
Based on the data of core, logging, well logging and seismic, the sequence stratigraphy and depositional system of Nantun Formation, the main target strata of the study area, are analyzed by well-seismic combination based on the tracing of seismic profiles and the comparison of continuous well sections. , Sedimentary facies belt, etc. By clarifying the sedimentary system type and sedimentary facies characteristics, revealing the combination distribution of sedimentary facies under the fourth-order sequence and making statistical analysis on the favorable sedimentary facies types in Nantun Formation, the results show that the strata of Nantun Formation are Sedimentary and filling of the syncline-depression in the basin. With the continuous expansion of the lake basin, a series of stratigraphic sequences mainly consisting of semi-deep lacustrine and deep lacustrine formations are formed, mainly including fan delta, braided river delta, sublacustrine fan, The main lithology in the first section of Nantun Formation is the gray sandstone and dark gray silty mudstone and mudstone interbedded with three fourth-order sequences from bottom to top. The depositional period is the first regional large Large-scale water age and large depositional thickness, the area was obviously controlled by the fault structure and was close to the synsedimentary fracture, showing obvious water inflow-water retrogressive turn, with the main source direction being northwest and northeast. The main sediments of the second member of Nantun Formation A set of gray, greenish gray siltstone Palygorskite sandstone with gray, greenish-gray sandy conglomerate, gray-white fine sandstone and thick gray-black mudstone partially subdivided into 2 fourth-order sequences from the bottom to the top, the main source direction is NE direction, secondary matter The source direction is southwest.