济阳坳陷新近系馆陶组湖泊沉积环境存在证据及沉积模式研究

Jiyang sag Neogene Guantao Formation rich oil and gas resources, in order to more clearly know reservoir, the sedimentary environment and the depositional model research has important scientific and realistic significance.Previous research has focused on the development of Guantao formation is river type sedimentary sand body, think Guantao formation common development fluvial facies sedimentary system, and there have been recent Bohaiwan basin Neogene guantao formation lacustrine deposition environment of the existing views. In recent years there have been also scholar of Jiyang sag Neogene Guantao Formation pure development fluvial facies environment this traditional concept a disagree, found the lakes there are some evidence that type, in the local area of innovative lacustrine deposition model has played a very good scientific guiding role. This study intends to fully digest, application in this core, geological, geochemical and geophysical well logging, and all kinds of analysis and assay material, clear solid lake facies of the existence of environment geology, the sedimentation and related comprehensive evidence, try to set up a more accord with the ancient river-geographic environment of lake sediment mode of Jiyang sag Neogene Guantao Formation sedimentary sand body development to provide scientific research guidance, to the Bohaiwan basin Neogene Guantao Formation paleogeographic reconstruction provide the scientific basis.

济阳坳陷新近系馆陶组油气资源丰富，为了更清晰地认识油藏，对济阳坳陷新近系馆陶组沉积环境和沉积模式研究具有重要的科学和现实意义。以往的研究集中于馆陶组较为发育的河道型沉积砂体，认为馆陶组普遍发育河流相沉积体系，而近期不断有渤海湾盆地新近系馆陶组存在湖相沉积环境的观点提出。近年来也不断有学者对济阳坳陷新近系馆陶组单纯发育河流相沉积环境这一传统观念提出异议，找到了湖泊相类型存在的一些证据，在局部地区创新性的湖相沉积模式已起到了很好的科学指导作用。该研究拟在充分消化、应用本区岩心、地质、地化、测井、地球物理以及各类分析化验资料，明确确凿的湖相沉积环境存在的地质、地化以及相关沉积学综合证据，力图建立更为符合古地理环境的河流-湖泊相沉积模式，为济阳坳陷新近系馆陶组沉积砂体发育研究提供科学指导，对整个渤海湾盆地新近系馆陶组沉积时期古地理重建提供科学依据。

济阳坳陷新近系馆陶组砂岩是胜利油区的主要储层之一，尤其孤岛油田是三亿吨级的典型浅层油气富集单元。为了更清晰地认识油藏，提高采收率，对沾化凹陷孤岛地区新近系馆陶组沉积模式和层序地层学研究具有重要的理论和现实意义。研究以详尽的沉积学研究为基础，摆脱传统观念的束缚，对馆陶组地层各时期沉积体系的沉积特征、微相划分、砂体展布、沉积模式和沉积演化进行了深入、细致的分析研究，并将研究成果应用于研究区馆陶组地层的高精度层序地层格架划分，以及沉积微相及有利砂体展布、小层对比、剩余油分布和油气勘探等生产实际，为油田的生产开发和勘探提供理论、技术支持。重点通过连续取心井的岩心观察，以及录井、测井、古生物资料，运用沉积学理论，丰富和发展了原有孤岛油田馆陶组仅仅普遍发育河流相的沉积观点，研究认为馆陶组下段发育砾质辫状河、辫状河三角洲—充填型浅水湖泊沉积体系；馆陶组上段发育辫状河、曲流河、曲流河三角洲—氧化型浅水湖泊、滨浅湖滩坝以及浅水振荡湖泊沉积体系。