鄂尔多斯盆地富县地区马五段喀斯特储层发育规律
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摘要
鄂尔多斯盆地富县地区位于岩溶高地,岩溶作用具有时间长强度大的特点,主力气层横向不连续。为了明确奥陶系马五段储层分布规律,通过岩心资料、测井资料及各种分析测试资料对富县地区马五段喀斯特储层进行研究,结果表明:(1)马五段地层角砾化严重,可以划分为4种岩溶相、3种洞穴相,岩溶强度自西向东逐渐增强;(2)马五段储层物性整体较差,储集空间主要为未被完全充填的溶蚀孔洞、膏模孔、裂缝及晶间溶孔,优质储层主要分布于北部马五6亚段顶部的裂纹—镶嵌角砾岩相中;(3)马五段储层发育规律主要受岩性、岩溶相—洞穴相和古地貌3个因素控制,岩性与古地貌控制岩溶相—洞穴相的形成与分布,岩溶相—洞穴相控制储层的分布规律。
Fuxian area of Ordos Basin is located in the palaeokarst upland.The karstification of Fuxianwas characterized by long duration and high intensity of action.The main gas production layer of Fuxian is not continuous in transverse direction.In order to find out the regularities of distribution of reservoirs in Ma 5 member,karst reservoirs in the Ma 5 member are studied through data analysis of cores,well logging and various tests.The results show that:(1)Ma 5 member is severely brecated,and can be divided into 4 karst facies and 3 cave facies.The intensity of karstification gradually increases from west to east.(2)The Ma 5 member has poor physical properties,and the reservoir space is mainly constituted of vugs,gypsum moldic pores,fractures that are not completely filled,intercrystalline pores and intercrystalline pores.High-quality reservoirs mainly distributed in the crackle-mosaic breccia facies at the top of Mawu-6 in the north.(3)The development of reservoirs in Ma 5 member is mainly controlled by three factors:Lithology,karst and cave facies,and paleotopography.Lithology and paleotopography control the development and distribution of karst facies and cave facies,and further control the distribution of reservoirs.
Fuxian area of Ordos Basin is located in the palaeokarst upland.The karstification of Fuxianwas characterized by long duration and high intensity of action.The main gas production layer of Fuxian is not continuous in transverse direction.In order to find out the regularities of distribution of reservoirs in Ma 5 member,karst reservoirs in the Ma 5 member are studied through data analysis of cores,well logging and various tests.The results show that:(1)Ma 5 member is severely brecated,and can be divided into 4 karst facies and 3 cave facies.The intensity of karstification gradually increases from west to east.(2)The Ma 5 member has poor physical properties,and the reservoir space is mainly constituted of vugs,gypsum moldic pores,fractures that are not completely filled,intercrystalline pores and intercrystalline pores.High-quality reservoirs mainly distributed in the crackle-mosaic breccia facies at the top of Mawu-6 in the north.(3)The development of reservoirs in Ma 5 member is mainly controlled by three factors:Lithology,karst and cave facies,and paleotopography.Lithology and paleotopography control the development and distribution of karst facies and cave facies,and further control the distribution of reservoirs.
引文
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[9] Jin Qiang,Tian Fei,Lu Xinbian,et al.Characteristics of collapse breccias filling in caves of runoff zone in the Ordovician karst in Tahe Oilfield,Tarim Basin[J].Oil&Gas Geology,2015,36(5):729-735.金强,田飞,鲁新便,等.塔河油田奥陶系古径流岩溶带垮塌充填特征[J].石油与天然气地质,2015,36(5):729-735.
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[12] Wei Qinlian,Wang Qicong,Xiao Ling.Prediction of paleokarst reservoirs in the fifth member of the Ordovician Majiagou Formation in Fu county area,Ordos Basin using seismic attribute analysis[J].Journal of Xi’an Shiyou University:Natural Science,2011,26(4):8-11.魏钦廉,王起琮,肖玲.鄂尔多斯盆地富县地区马五段古岩溶储层地震预测[J].西安石油大学学报:自然科学版,2011,26(4):8-11.
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[16] Yang Hua,Fu Suotang,Ma Zhenfang,et al.Characteristics of Ordovician dolomite reservoir bodies in Tianhuan region[J].Natural Gas Industry,2004,24(9):11-14.杨华,付锁堂,马振芳,等.天环地区奥陶系白云岩储集体特征[J].天然气工业,2004,24(9):11-14.
[17] Yang Hua,Xi Shengli,Wei Xinshan,et al.Evolution and natural gas enrichment of multicycle superimposed basin in Ordos Basin[J].China Petroleum Exploration,2006,11(1):17-24.杨华,席胜利,魏新善,等.鄂尔多斯多旋回叠合盆地演化与天然气富集[J].中国石油勘探,2006,11(1):17-24.
[18] Chen Anqing,Yang Shuai,Chen Hongde,et al.The sedimentary filling model of epeiric platform and new inspiration of innercratonic carbonate for oil&gas exploration[J].Acta Petrologica Sinica,2017,33(4):1243-1256.陈安清,杨帅,陈洪德,等.陆表海台地沉积充填模式及内克拉通碳酸盐岩勘探新启示[J].岩石学报,2017,33(4):1243-1256.
[19] Huang Zhengliang,Wu Chunying,Ma Zhanrong,et al.Sedimentary sequence of Ordovician Majiagou Formation in central and eastern part of Ordos Basin and its control over reservoir development[J].China Petroleum Exploration,2015,20(5):20-29.黄正良,武春英,马占荣,等.鄂尔多斯盆地中东部奥陶系马家沟组沉积层序及其对储层发育的控制作用[J].中国石油勘探,2015,20(5):20-29.
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