摘要
鄂尔多斯南部奥陶系天然气勘探须重视风化壳古岩溶带和层间古岩溶带。风化壳古岩溶带的层位因地而异，东北部的马家沟组五段为具溶蚀膏模孔洞型的白云岩储层，具有优越的孔渗条件，Ⅴ１区可望找到靖边气田式储层。层间古岩溶带可分为４期，经多期层间岩溶改造的马家沟组三、五段可形成更为发育的溶蚀膏模型储层，具有勘探前景，勘探靶区应在黄陵黄龙一带以北地区。中奥陶统台缘生物礁及礁后滩勘探靶区应在永寿淳化旬邑之间。
The paleokarst zone of Caledonian weathering crust at the top of Ordovician in south Ordos is different from the one in Middle Ordos'but the gypsum cast corroded pore reservoirs of the 5th Member of the Lower Ordovician Majiagou Formation in the northeast part of south Ordos is similar to those in Middle Ordos.Different formations are located in different positions of the weathering crust of south Ordos.Reservoirs of the 3rd and 5th Members of the Majiagou Formation,undergone multi stage interstratum karst corrosion in geohistory,can be induced into four major stages and develop into favourable gypsum cast resorvoirs.The target area of oil and gas exploration should be set northward of Huangling Huanglong area;that of the platform marginal reef and backreef beach of Middle Ordovician should be set between Yongshou Chunhua Xunyi areas.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1997年第4期294-299,共6页
Oil & Gas Geology
基金
国家八五重点科技攻关专题
