银额盆地YHC1井白垩系气藏形成的地质环境及其远景意义

发布时间：2018-04-14 17:20

  本文选题：YHC井 + 白垩系气藏　； 参考：《天然气地球科学》2017年03期

【摘要】：作为国内为数不多的未进行系统油气勘探、开发的大型古—中生代多旋回叠合沉积盆地,YHC1井气藏的突破势必将引领银额盆地进一步的勘探投入,促进银额盆地新区块、新层系油气的新发现,从而使其成为未来的勘探重点。通过地质与地球物理方法相结合,钻测井、地震、古生物、地球化学等资料"四位一体",首次对银额盆地YHC1井白垩系气藏形成的地质环境进行了深入的研究,尤其是在地层展布、构造发育、烃源岩特征、沉积储层分析、成藏模式及远景意义等方面取得了如下重要成果和新认识:1研究区发育2套主要目的层系——中生界白垩系K、上古生界C—P,其中白垩系整体分布广、厚度大,哈日凹陷、拐子湖凹陷是它的主要发育地区,YHC1井位于沉积中心,保证了YHC1白垩系气藏地层体系的完整性。2研究区内呈现"凹凸相间"的构造格局,断裂均为正断层,多集中在各凹陷的中央,控凹边界断裂控制着研究区的构造格局和沉积体系发育,形成北北东走向的单断箕状凹陷,促进了YHC1井白垩系气藏储集空间的形成。3白垩系沉积时期YHC1井一直处于良好的有效烃源岩富集区,烃源岩成熟度好,生烃潜力大,其巴音戈壁组发育的大套深灰色—黑色含灰泥岩成为该气藏形成最重要的基石。4白垩系发育的沉积体系为水下扇、扇三角洲、辫状河、辫状河三角洲、湖泊和火成岩相,YHC1井优势体系多为半深湖—深湖沉积体系,决定了有机物的转化、保存以及储层发育的环境。5钻井揭示白垩系沉积时期,YHC1井偶见Ⅲ类和Ⅳ类储层,多以Ⅴ类(非)储层出现。6YHC1井巴音戈壁组出气层段可能为裂缝贯通及溶蚀孔洞的含碳酸盐质泥岩气藏体系,推断属源内成藏的特殊岩性油气藏。
[Abstract]:As one of the few non-systematic oil and gas exploration in China, the breakthrough of YHC1 well gas reservoir in the large Paleo-Mesozoic multi-cycle superimposed sedimentary basin is bound to lead to further exploration investment and promote the new block of Yinying basin.The new discovery of oil and gas in the new strata makes it the focus of exploration in the future.Through the combination of geology and geophysics, the geological environment of Cretaceous gas reservoir formation of YHC1 well in Yinyou Basin is studied for the first time by drilling logging, seismic, paleontology, geochemistry and other data "four-in-one".Especially in stratigraphic distribution, structural development, source rock characteristics, sedimentary reservoir analysis,The reservoir formation model and its prospective significance have obtained the following important achievements and new understanding of the development of two sets of major target strata, namely, the Mesozoic Cretaceous Kand, the Upper Paleozoic C-P, in which the Cretaceous has a wide distribution, a large thickness, and a Hari sag.Kuizihu sag is its main development area, well YHC1 is located in the center of sedimentation, which ensures the integrality of stratigraphic system of YHC1 Cretaceous gas reservoir in the "concave and convex" tectonic pattern, and the faults are normal faults.Most of them are concentrated in the center of each sag, and the boundary faults control the development of tectonic framework and sedimentary system in the study area, forming a single-faulted dustpan sag with NNE strike.The formation of reservoir space of Cretaceous gas reservoir in YHC1 well. 3. During the Cretaceous sedimentary period, YHC1 well has been in a good effective source rock accumulation area, with good hydrocarbon source rock maturity and great hydrocarbon generation potential.The large set of dark gray-black mudstone formed in the Bayingobi formation is the most important cornerstone of the formation of the gas reservoir. The sedimentary systems of Cretaceous system are subaqueous fan, fan delta, braided river, braided river delta, and braided river delta.The dominant systems of lake and igneous facies in YHC1 well are mostly semi-deep lacustrine-deep lake sedimentary systems, which determine the organic matter transformation, preservation and reservoir development. The environmental .5 well drilling reveals that there are occasionally 鈪，

本文编号：1750302