乾安—两井地区黑帝庙油层地层对比与沉积相研究
发布时间：2018-12-24 11:40
【摘要】：前人针对长岭凹陷黑帝庙油层成藏规律开展了系统研究工作,认为该区从沉积演化的历史来看其第二次湖侵顶峰为嫩二段早期,嫩二段晚期直到嫩五段沉积时期,湖泊水表现为扩张-萎缩的过程,嫩四段沉积时期,研究区为水侵特征。在湖盆逐渐萎缩的前提下黑帝庙油层受限于松辽盆地北部物源而形成了三角洲前缘亚相沉积。同时明确了黑帝庙油层油源为嫩江组烃源岩,嫩一段暗色泥岩厚度60m线控制了油气显示范围;理清构造特征,存在大安-新立背斜构造带、乾安-两井鼻状构造与黑帝庙次凹;利用266口开发井编制了黑帝庙油层的沉积相展布图,建立了北部物源由HⅡ3砂组至HⅠ6砂组由北向南逐渐进积的沉积模式;总结了构造、断裂、沉积在油气成藏中的控制作用,把长岭凹陷黑帝庙油层划分为三个岩性油藏勘探区,即北部沿江构造-岩性成藏带、中部乾安两井断层岩性成藏带和南部大情字井-黑帝庙岩性成藏带,揭示了2.5亿吨资源潜力。而长岭凹陷三个构造带黑帝庙油层勘探程度较低,黑帝庙油层一直作为兼探层系,没有得到足够的勘探与开发。因此以乾安-两井地区黑帝庙油层为研究重点,在总结前人经验的基础上,以前人资料和勘探成果再认识为线索,通过等时地层精细对比、沉积微相分析、砂体精细刻画等手段,开展区域沉积微相分析,从而优选有利目标区,并取得了如下认识:(1)建立了黑帝庙油层层序地层格架,乾安-两井地区黑帝庙油层划分为3个中期,5个短期,并在层序划分的基础上,识别出乾安-两井地区黑帝庙油层沉积基准面变化所反映出水退→水进→水退的演化序列。(2)通过取芯井的岩性特征、沉积结构、构造、古生物、电性等特征的综合分析,建立标准微相柱状图,明确黑帝庙油层沉积相类型及微相特征,主要发育水下分流河道、河口坝、席状砂、叠置席状砂、前三角洲相。(3)通过岩心观察分析,密井网解剖,建立砂体识别标准,对全区砂体进行精细刻画。全部砂体一般8-10层,其中骨干砂体4-5层,累计厚度10m以上,叠加连片展布。(4)通过物源、单井相、剖面相、平面相,由点到面对全区黑帝庙油层沉积环境及沉积相展布进行细致分析,认为黑帝庙油层三角洲前缘砂体向湖延伸较远是受河控影响较大,波浪的侵蚀速度远远小于砂体堆积速度。枝状三角洲呈现出明显的树枝状,各朵体分散、朵体间不连接或通过决口水道连接,呈现出窄条状的特征。
[Abstract]:According to the history of sedimentary evolution in Heidimiao reservoir, Changling sag, the authors carried out systematic research work, and considered that the peak of the second lake transgression in this area was the early stage of the second member of the Nen member, the late stage of the member of the second member and the period of sedimentation of the fifth member of Nenjiang formation. The lake water is an expansion-atrophy process, and the study area is characterized by water invasion during the depositional period of the fourth member. Under the condition that the lake basin gradually shrinks, the Heidimiao reservoir is limited by the source of the northern Songliao Basin and forms the delta front subfacies deposit. At the same time, it is clear that the source of the Hedimiao reservoir is the source rock of Nenjiang formation, and the dark mudstone thickness 60m line of the first member of Nen control the oil and gas display range, clear up the structural characteristics, exist the Da-Xinli anticline structural belt, the nose structure of Gan'an two wells and the Hedimiao sub-depression; Based on 266 development wells, the sedimentary facies distribution diagram of Heidimiao reservoir is compiled, and the sedimentary model from H 鈪，
本文编号：2390573
[Abstract]:According to the history of sedimentary evolution in Heidimiao reservoir, Changling sag, the authors carried out systematic research work, and considered that the peak of the second lake transgression in this area was the early stage of the second member of the Nen member, the late stage of the member of the second member and the period of sedimentation of the fifth member of Nenjiang formation. The lake water is an expansion-atrophy process, and the study area is characterized by water invasion during the depositional period of the fourth member. Under the condition that the lake basin gradually shrinks, the Heidimiao reservoir is limited by the source of the northern Songliao Basin and forms the delta front subfacies deposit. At the same time, it is clear that the source of the Hedimiao reservoir is the source rock of Nenjiang formation, and the dark mudstone thickness 60m line of the first member of Nen control the oil and gas display range, clear up the structural characteristics, exist the Da-Xinli anticline structural belt, the nose structure of Gan'an two wells and the Hedimiao sub-depression; Based on 266 development wells, the sedimentary facies distribution diagram of Heidimiao reservoir is compiled, and the sedimentary model from H 鈪，
本文编号：2390573
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