松辽盆地双辽断陷火石岭—营城组油气地质特征研究

发布时间：2018-05-29 13:45

  本文选题：松辽盆地 + 双辽断陷　； 参考：《吉林大学》2017年硕士论文

【摘要】：双辽断陷位于松辽盆地东南隆起区东部断陷带的西南部。断陷面积约1233km2,地层最大厚度可达3680m。断陷期发育地层主要为火石岭组、沙河子组和营城组,研究相对薄弱。针对这一问题,本次通过对前期资料的广泛搜集,以钻井、岩心及测试分析为基础,利用地震资料解释,分析断陷结构及其演化特征,识别目的层位地震相,并根据井震对比建立研究区地震相与岩相的对应关系;同时,通过测井、地震、岩心和测试数据综合研究,确立双辽断陷岩相展布,明确断陷的生储盖条件,剖析油气地质特征及成藏主控因素,并开展有利勘探区带预测。通过单井相分析,结合地震资料解释可知,双辽断陷火石岭-营城组发育有一定规模的陆源碎屑岩和火山岩,共识别出湖泊相、扇三角洲相、湖底扇相、近岸水下扇相及火山岩相5种岩相类型,并在此基础上进一步识别出了7种亚相和12种微相。另据地震反射特征的“振幅+连续性+反射结构+外形”参数组合,在研究区识别出16种地震相型,建立了岩相与地震相的对应关系;并进一步揭示了火石岭组发育时期,研究区物源主要来自于断陷的西部和西北部,且发育浅湖—扇三角洲—近岸水下扇—火山岩相建造体系;沙河子组时期研究区物源主要来自于西部和东南部,发育半深湖—扇三角洲—近岸水下扇—湖底扇建造体系;而营城组时期研究区物源主要来自于西部、西北部和东南部,发育为浅湖—扇三角洲—近岸水下扇—湖底扇—火山岩相建造体系。根据研究区岩心测试分析得出,沙河子组烃源岩有机质类型较好,并处于成熟演化阶段,是研究区的主要烃源岩;营城组次之,火石岭组受样品数量及品质限制,初步认为生烃能力最差。储集物性方面,研究区储层分为两大类,碎屑岩储集层主要分布在营城组和沙河子组,以特低孔、低渗为主;火山岩储集层主要发育在火石岭组,且孔隙度以Ⅲ-Ⅳ-Ⅴ类为主,渗透率以Ⅴ类为主。综合分析得出,研究区主要发育上生下储和自生自储两种生储盖组合类型。根据研究区钻井试油结果,结合测井、地震等资料分析得出,研究区气藏(含油)主要发育于火石岭组的火山穹隆构造中,为火山穹隆构造—岩性气藏。其成藏主控因素包括有利的油气源供给、有利的储集相带发育、有利的生储盖组合以及成藏因素有利时空配置4方面;据此预测,火山穹窿构造发育且与沙河子组及营城组烃源岩构成有利时空配置的双辽次凸,是今后油气勘探的有利目标区。
[Abstract]:Shuangliao fault depression is located in the southwest of the eastern fault depression in the southeast uplift area of Songliao Basin. The area of fault subsidence is about 1233km2, and the maximum thickness of strata can reach 3680m. In the faulted period, the main strata are the Huoshiling formation, the Shahezi formation and the Yingcheng formation, and the study is relatively weak. In order to solve this problem, based on drilling, core and test analysis and seismic data interpretation, fault subsidence structure and its evolution characteristics are analyzed, and the seismic facies of target horizon are identified. The relationship between seismic facies and lithofacies in the study area is established according to well seismic correlation, meanwhile, through comprehensive study of logging, seismic, core and test data, the distribution of lithofacies in Shuangliao fault depression is established, and the conditions of formation, reservoir and cover of fault depression are determined. The geological characteristics of oil and gas and the main controlling factors of oil and gas accumulation are analyzed, and the favorable exploration zone prediction is carried out. Through single well facies analysis and seismic data interpretation, it can be seen that there are some scale continental clastic rocks and volcanic rocks developed in Huoshiling Yingcheng formation of Shuangliao fault depression, and the lacustrine facies, fan delta facies and sublacustrine fan facies are identified. There are 5 lithofacies types of subaqueous fan facies and volcanic facies, and on this basis, 7 subfacies and 12 microfacies are further identified. In addition, according to the "amplitude continuous reflection structure shape" parameter combination of seismic reflection characteristics, 16 types of seismic facies are identified in the study area, the corresponding relationship between lithofacies and seismic facies is established, and the developing period of Huosiling formation is further revealed. The provenance of the study area mainly comes from the west and northwest of the fault depression, and develops the shallow lacustrine fan delta nearshore subaqueous fan volcanic facies formation system, and the material source of the study area in the Shahezi formation period mainly comes from the west and the southeast. The semi-deep lacustrine fan delta near-shore subaqueous fan and sublacustrine fan formation system are developed, and the material sources of the study area in Yingcheng formation are mainly from the west, northwest and southeast. It is a shallow lacustrine fan delta sublacustrine fan volcanic facies system. According to the core test and analysis in the study area, the source rock of Shahezi formation is of good organic matter type and is in the mature evolution stage, which is the main source rock of the study area, the Yingcheng formation is the second, and the Huosiling formation is restricted by the quantity and quality of the sample. It is preliminarily considered that hydrocarbon generating ability is the worst. In terms of reservoir physical properties, the reservoirs in the study area can be divided into two categories: the clastic rock reservoirs are mainly distributed in Yingcheng formation and Shahezi formation, with very low porosity and low permeability, and volcanic rock reservoirs are mainly developed in the Huosiling formation. The porosity is mainly 鈪，

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