塔河油田奥陶系碳酸盐岩油藏溶洞发育规律
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摘要
塔河油田奥陶系碳酸盐岩缝洞型储层为该区最重要的油气生产层段。依据地质岩心(屑)、录井、钻井、测井、地震等多种资料,运用由点到线再到面的方法,探讨了塔河油田奥陶系碳酸盐岩油藏的溶洞发育规律。由区内溶洞充填砂泥岩的伊利石K-Ar同位素定年,得出其形成时间在369.33～451.90Ma,古溶洞的形成时间应该早于该时段或与该时段同时,即加里东中晚期—海西早期。溶洞的发育受控于古地貌,存在三个纵向溶洞带。岩溶水输入方式的不同,使得塔河地区溶洞的平面分布分区性较强。北部区奥陶系鹰山组和一间房组中的岩溶水为面状输入方式,南部有上奥陶统隔水层覆盖的区,鹰山组和一间房组中岩溶水为侧向输入方式,岩溶水的出口位置位于断裂带附近,尤其是断裂带与断裂带相交的部位。塔河油田北部和南部的岩溶水系统基本为一个统一的系统。建立了该区大气淡水岩溶模式。
Ordovician carbonate fissuring/cavernous reservoirs are the important oil pay beds in Tahe Oilfield.Based on the K-Ar isotopic dating for illite from sandstone and mudrock filling in the karstic caverns of the reservoirs,the formation time of cave-fillings is during 369.33-451.90Ma and thus that of the paleocaverns should be earlier than or equal to the 369.33-451.90Ma,which is corresponding to the late Caledonian-early Hercynian periods.There are three vertical cavern zones in Tahe area.Paleocavern development was controlled by paleo-landform.Karstic water input in different ways which resulted in the divisional distribution of caverns in plane in this area.In northern area,the karst water behaved as a planar way of input into the Ordovician Yingshan and Yijianfang strata while in the southern area,the water did as a lateral way of input into the same strata that are covered by impermeable upper Ordovician rocks.Exit of karstic water was located near the fault zone,The karstic water basically belongs to a unified system in the northern and the southern parts of the oilfield.A local model of meteoric karst reservoir is established.
Ordovician carbonate fissuring/cavernous reservoirs are the important oil pay beds in Tahe Oilfield.Based on the K-Ar isotopic dating for illite from sandstone and mudrock filling in the karstic caverns of the reservoirs,the formation time of cave-fillings is during 369.33-451.90Ma and thus that of the paleocaverns should be earlier than or equal to the 369.33-451.90Ma,which is corresponding to the late Caledonian-early Hercynian periods.There are three vertical cavern zones in Tahe area.Paleocavern development was controlled by paleo-landform.Karstic water input in different ways which resulted in the divisional distribution of caverns in plane in this area.In northern area,the karst water behaved as a planar way of input into the Ordovician Yingshan and Yijianfang strata while in the southern area,the water did as a lateral way of input into the same strata that are covered by impermeable upper Ordovician rocks.Exit of karstic water was located near the fault zone,The karstic water basically belongs to a unified system in the northern and the southern parts of the oilfield.A local model of meteoric karst reservoir is established.
引文
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[4]钱一雄,蔡立国,李国蓉,等.碳酸盐岩岩溶作用的元素地球化学表征——以塔河1号的S60井为例[J].沉积学报,2002,20(1):70-74.
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[7]徐微,蔡忠贤,贾振远,等.塔河油田奥陶系碳酸盐岩油藏溶洞充填物特征[J].现代地质,2010,24(2):287-293.
[8]张有瑜,罗修泉.油气储层自生伊利石K-Ar同位素年代学研究现状与展望[J].石油与天然气地质,2004,25(2):231-236.
[9]朱学稳,张元海,张任,等.地下河洞穴发育的系统演化[J].中国岩溶,1996,15(1):158-166.
[10]Ford D C,Williams P W.Karst geomorphology and hydrology[M].London:the Academic Division of Unwin Hyman Ltd,1989.
[11]Ford D C,Ewers R O.The development of limestone cave sys-tems in the dimensions of length and depth[J].Can J Earth Sci,1978,15(11):1783-1798.
[2]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):23-26.
[3]张希明.新疆塔河油田下奥陶统碳酸盐岩缝洞型油气藏特征[J].石油勘探与开发,2001,28(5):17-22.
[4]钱一雄,蔡立国,李国蓉,等.碳酸盐岩岩溶作用的元素地球化学表征——以塔河1号的S60井为例[J].沉积学报,2002,20(1):70-74.
[5]Zhang Tao,Yan Xiangbin.A study of the genesis of karst-typesubtle reservoir in Tahe Oilfield[J].Petroleum Science,2004,1(2):99-104.
[6]徐微,贾振远,蔡忠贤.碳酸盐岩古风化壳储层溶洞特征研究——以塔河油田奥陶系油藏为例[J].石油天然气学报,2005,27(1):156-158.
[7]徐微,蔡忠贤,贾振远,等.塔河油田奥陶系碳酸盐岩油藏溶洞充填物特征[J].现代地质,2010,24(2):287-293.
[8]张有瑜,罗修泉.油气储层自生伊利石K-Ar同位素年代学研究现状与展望[J].石油与天然气地质,2004,25(2):231-236.
[9]朱学稳,张元海,张任,等.地下河洞穴发育的系统演化[J].中国岩溶,1996,15(1):158-166.
[10]Ford D C,Williams P W.Karst geomorphology and hydrology[M].London:the Academic Division of Unwin Hyman Ltd,1989.
[11]Ford D C,Ewers R O.The development of limestone cave sys-tems in the dimensions of length and depth[J].Can J Earth Sci,1978,15(11):1783-1798.
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