塔河油田奥陶系岩溶油藏溶洞储集体成因及演化
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摘要
古岩溶作用形成的溶洞、溶孔、裂缝构成了塔河油田奥陶系缝洞型油藏的重要储集体,控制油气分布。塔河油田奥陶系古岩溶发育主要经历了加里东期和海西早期岩溶作用的改造,通过对塔河油田岩溶作用演化及发育期次的研究,认为O3s尖灭线以北为海西早期岩溶及加里东期岩溶共同作用的结果,以南区域主要为加里东期岩溶发育区。利用岩心、钻井、录井、测井、地震等资料相结合的方法,将塔河油田溶洞储集体从成因上划分为侵蚀型溶洞、异地沉积物充填型、原地沉积物充填型、塌陷型溶洞4种类型。结合塔河油田岩溶储层发育特征,建立了塔河油田奥陶系岩溶洞穴型储层的纵向分布模式和平面分布模式。
Karst caves,holes and cracks are important oil conductivity to Ordovician fractured reservoir and control the distribution of oil and gas in Tahe oilfield.Karst system of Ordovician reservoir in Tahe oilfield developed from Caledonian to Early Hercynian.Based on the karst origin,evolution and growth mechanism of Tahe oilfield,it is considered that the north area of pinch O3s is the result of karst in Caledonian and Early Hercynian,and the south area of pinch O3s is the result of karst in Caledonian.Utilization of core,drilling,logging and seismic data,the carbonated caved-fracture reservoir caves are divided into 4 types: Excavation or dissolution by aggressive fluids;Deposition of allochthonous(externally derived) sediments;Deposition of autochthonous(internal derivation and precipitation) sediments;Collapse at near-surface and in subsurface.Finally,the article establishes the distribution pattern of carbonated caved-fracture reservoir.
Karst caves,holes and cracks are important oil conductivity to Ordovician fractured reservoir and control the distribution of oil and gas in Tahe oilfield.Karst system of Ordovician reservoir in Tahe oilfield developed from Caledonian to Early Hercynian.Based on the karst origin,evolution and growth mechanism of Tahe oilfield,it is considered that the north area of pinch O3s is the result of karst in Caledonian and Early Hercynian,and the south area of pinch O3s is the result of karst in Caledonian.Utilization of core,drilling,logging and seismic data,the carbonated caved-fracture reservoir caves are divided into 4 types: Excavation or dissolution by aggressive fluids;Deposition of allochthonous(externally derived) sediments;Deposition of autochthonous(internal derivation and precipitation) sediments;Collapse at near-surface and in subsurface.Finally,the article establishes the distribution pattern of carbonated caved-fracture reservoir.
引文
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[2]康玉柱.塔里木盆地古生代海相碳酸盐岩储集岩特征[J].石油实验地质,2007,29(3):217-223.
[3]阎相宾.塔河油田下奥陶统古岩溶作用及储层特征[J].江汉石油学院学报,2002,24(4):23-25.
[4]叶德胜.新疆塔里木盆地北部储层沉积、成岩特征及储层评价[M].成都:成都科技大学出版社,1995:125-128.
[5]郭建华.塔北、塔中地区下古生界深埋藏古岩溶[J].中国岩溶,1996,15(3):207-216.
[6]赵明,樊太亮,于炳松,等.塔中地区奥陶系碳酸盐岩储层裂缝发育特征及主控因素[J].现代地质,2009,23(4):709-718.
[7]林忠民.塔河油田奥陶系碳酸盐岩储层特征及成藏条件[J].石油学报,2002,23(3):23-27.
[8]高成军.碳酸盐岩储层测井与录井评价技术[M].北京:石油工业出版社,2007:252-254.
[9]康玉柱.中国古生代碳酸盐岩古岩溶储集特征与油气分布[J].天然气工业,2008,28(6):1-12.
[10]Loucks R G.Paleocave carbonatereservoirs:origins,burial depthmodifications,spatial complexity,and reservoir implications[J].AAPG Bulletin,1999,83(11):1795-1834.
[11]Loucks R G,Paul K Mescher,George A McMechan.Three-di-mensional architecture of a coalesced,collapsed-paleocave systemin the Lower Ordovican Ellenburger Group,central Texas[J].AAPG Bulletin,2004,88(5),545-564.
[12]Potter P E,Shimp N F,Witters J.Trace elements in marine andfresh-water argillaceous sediments[J].Geochimica et Cosmo-chimica Acta,1963,27:669-694.
[13]李国蓉,吴征,刘存革.塔里木盆地阿克库勒凸起奥陶系碳酸盐岩岩溶作用及成藏机制[R].乌鲁木齐:中国石油化工股份有限公司西北石油局,2004.
[14]刘小平,孙冬胜.古岩溶地貌及其对岩溶储层的控制———以塔里木盆地轮古西地区奥陶系为例[J].石油实验地质,2007,29(3):265-268.
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