鄂尔多斯南部古生代储盖组合及评价

鄂尔多斯南部中寒武统张夏组白云岩晶间溶孔储层、下奥陶统亮甲山组上部白云岩溶蚀孔洞储层、下马家沟组三段层间岩溶带溶蚀膏模孔洞储层、上马家沟组二-四段层间岩溶带及风化壳岩溶带储层、中奥陶统平凉/泾河组台缘礁滩组合、后礁带及礁后滩,均是具有勘探前景的储层。全区自上而下划分出5套储盖组合,在7个勘探区块中,以第1,2区块储盖组合最佳。

PALEOZOIC RESERVOIR-CAP COMPLEX AND EVALUATION IN SOUTH ORDOS

Following reservoirs of Lower Paleozoic in South Ordos are prospective for oil and gas exploration:dolomite intercrystalline pore reservoir of Middle Cambrian Zhangxia Formation;dolomite corroded pore and vug reservoir of tidal flat facies of Lower Ordovician Liangjiashan Formation;gypsum cast corroded pore and vug reservoir of supratidal flat facies of the 3rd and 5th Members of Lower Ordovician Majiagou Formation;the interlayer karst weathered crust karst reservoirs of the 2nd～4th Members of the Upper Majiagou Formation;dolomite reservoirs of marginal reef bank complex of Middle Ordovician Pingliang Jinghe Formations.The shale and coal series of Upper Paleozoic Benxi～Taiyuan～Shanxi Formations serve as regional cap rocks.Five reservoir cap rock complexes have been recognized,and within the seven prospecting target blocks in South Ordos,the first and second blocks have the best reservoir cap rock assemblages.