长岭断陷龙凤山地区营城组油气分布规律

发布时间：2018-05-03 13:11

  本文选题：龙凤山构造 + 砂体展布　； 参考：《西南石油大学》2017年硕士论文

【摘要】：作为松辽盆地长岭断陷油气藏勘探开发的热点,龙凤山构造低孔、低渗储层受到重视。该构造位于长岭断陷长岭深凹南部,营城组为其主力产气层系,具有良好的勘探潜力。但储层物性整体较差,有效储层段薄,横向变化大,有效油气储层空间展布规律不清。针对营城组的勘探现状,在前人研究成果的总结基础上,对研究区目的层段营城组油气分布规律进行了系统研究,进一步认识龙凤山气田成藏地质规律,实现营城组含气层段的进一步突破及快速增产。本次研究主要通过区域地质资料、生产动态资料和测井、录井资料等进行沉积微相、砂体展布、储层岩石学特征、物性特征、成岩作用等研究,结合油气藏成藏的基本要素进行分析,了解油气的分布规律。在充分认识了构造演化特征、沉积背景等基础上,研究认为该区主要为扇三角洲沉积、辫状河三角洲沉积和湖泊相沉积体系,划分出三角洲平原、三角洲内前缘、三角洲外前缘、滨-浅湖以及半深湖几种亚相,可进一步识别出水下分流河道、辫状河道、滩坝砂等微相。营Ⅲ-Ⅳ各小层砂体厚度变化大,横向变化快,纵向上多套砂体叠置,影响油气的分布。龙凤山地区营城组为一套近物源堆积,主要岩石类型为中-细粒的砾岩、砂砾岩和粗砂,粒度较粗,分选较差。填隙物主要有粘土、方解石和硅质。通过对岩石薄片的鉴定认为该区主要的岩石类型有压实作用、胶结作用和溶蚀作用,储层孔隙可划分为粒间孔、溶蚀孔隙与微孔三种类型,储层致密低渗,物性变化快、非均质性强。营城组和沙河子组沉积有巨厚的暗色泥岩,有机质类型好,成熟度高,为研究区主力烃源岩。营Ⅱ段火山岩与营Ⅲ段泥岩为研究区两套稳定的盖层,双重盖层的存在是油气保存的有利条件。圈闭的形成受到了岩性和构造的双重因素控制,为构造-岩性气藏。断层、构造、砂体发育状况较好,具有良好的油气运移聚集条件。综合以上分析,认为沙河子组厚层烃源岩是基础,油气富集于生烃中心附近,区域上控制了天然气的分布;排烃前东南斜坡的继承性鼻状构造有利于油气聚集;三角洲前缘水下分流河道优势相带控制了优质储层的发育,影响了储层物性,控制油气聚集,为其充注和存储提供了条件;双重盖层的存在是油气藏得以保存的关键因素。
[Abstract]:As a hot spot in exploration and development of oil and gas reservoirs in Changling fault depression of Songliao Basin, low porosity and low permeability reservoirs in Longfengshan structure are paid more attention to. The structure is located in the south of Changling deep depression in Changling fault depression, and Yingcheng formation is the main gas-producing strata, which has good exploration potential. But the physical property of the reservoir is poor, the effective reservoir is thin, the lateral change is large, and the spatial distribution of the effective oil and gas reservoir is unclear. In view of the present exploration situation of Yingcheng formation, on the basis of the summary of previous research results, the oil and gas distribution law of Yingcheng formation in the target zone of the study area is systematically studied, and the reservoir forming geological law of Longfengshan gas field is further understood. To achieve further breakthrough and rapid increase of production in the gas bearing zone of Yingcheng formation. In this study, sedimentary microfacies, sandbody distribution, reservoir petrology, physical properties, diagenesis and so on are studied by means of regional geological data, production dynamic data, logging and logging data. Based on the analysis of the basic elements of oil and gas reservoir formation, the distribution law of oil and gas is understood. On the basis of fully understanding the characteristics of tectonic evolution and sedimentary background, it is considered that the area is mainly composed of fan delta, braided river delta and lacustrine facies sedimentary systems, which can be divided into delta plain and delta front. The subfacies of delta outer front, shore-shallow lake and semi-deep lake can be further identified as subaqueous distributary channel, braided channel, beach bar sand and so on. The thickness of sand bodies in each sub-layer of Ying 鈪，

本文编号：1838611