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区域构造-沉积演化背景与研究区大量岩心、测井资料分析相结合的沉积相分析表明,下泥盆统F4层段属于处于陆隆部位的半深海背景下的海底扇沉积.以F4层段中部稳定发育的深海泥岩段为区域对比标志层,将其分为上部和下部2个旋回,分别对应2期扇体的形成与发育过程.以各扇体内部较为稳定的泥岩为次级对比标志层,可进一步将各扇体划分出相当于砂层组级别的地层单元,由此建立了F4层段具有时间意义的地层对比格架.在分析各扇体沉积亚相类型与成因机制的基础上,认为F4层段储层成因类型主要包括辫状水道复合体、沉积型水道和水道末段舌状体3种类型.在高精度时间地层格架内,分析了储集砂体平面展布规律,并提出F4层段海底扇至少存在来自北西西和东南2个方向的物源供给体系,属于多点物源和砂质扇成因类型.该研究不仅为重力流沉积层序地层划分和对比提供了研究思路与方法,同时也为F4层段剩余油的分布研究提供了可靠的地质模型,为油藏的深入开发挖潜提供了科学依据.
Regional tectonic-sedimentary evolution Background Sedimentary facies analysis combining with a large number of cores and well logging data in the study area shows that the Lower Devonian F4 belongs to the submarine fan in the semi-deep sea background, The deep-seated mudstone in central China is the regional contrast marker, which is divided into upper and lower two cycles, which correspond to the formation and development of two-stage fan body respectively. The relatively stable mudstone in each sector is the secondary contrast marker Strata can be further divided into strata units corresponding to the sand group level, so as to establish a time-stratigraphic contrast frame in the F4 interval.Based on the analysis of the subfacies of sedimentary facies and their genetic mechanism , It is considered that the genetic types of reservoirs in F4 layer mainly include three types of braided water channel complex, sedimentary water channel and the last tongue of the waterway.In the high-precision time stratigraphic framework, And it is suggested that there are at least two source supply systems from the northwest and southeast of the submarine fan in the F4 layer and belong to the multi-point source rocks and sandy fan genetic types.This study not only shows that the gravitational flow sedimentary sequence stratigraphy and Distribution ratio provides research ideas and methods, but also for the F4 segment remaining oil layer provides a reliable geological model, provide a scientific basis for the further development of tapping the potential of the reservoir.