滨里海盆地M区块晚石炭世古地貌恢复与白云岩储层预测  

Paleogeomorphology Recovery and Reservoir Prediction of Upper Carboniferous in M Block,Pre-Caspian Basin

作　　者：苗钱友[1] 朱筱敏[1] 李国斌 郭洪明[2] 杨勤林[4] 张静 张亚军 洪亮 

机构地区：[1]中国石油大学地球科学学院,北京昌平102249 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020 [3]中油阿克纠宾油气股份公司,哈萨克斯坦阿克纠宾030002 [4]中国石化石油物探技术研究院,江苏南京210014

出　　处：《地球科学（中国地质大学学报）》2014年第7期871-879,共9页Earth Science-Journal of China University of Geosciences

基　　金：中石油海外油气勘探项目(No.2008E-1606);国家重大油气专项资助项目(No.2011ZX05029-002)

摘　　要：白云岩储层的发育主要受原始沉积岩性和后期溶蚀作用影响,原始沉积岩性受沉积时古地貌控制,后期溶蚀作用受溶蚀古地貌控制.滨里海盆地M区块石炭世KT-Ⅰ层有利储集岩为溶蚀白云岩,分布在KT-Ⅰ层顶部,孔隙类型为晶间(溶)孔、粒内溶孔和生物体腔孔.M区块石炭系沉积时为"西高东低"古地貌背景,在二叠世早期地层回返呈"东高西低"特征,KT-Ⅰ层顶部遭受剥蚀.通过残余地层厚度法和沉积补偿厚度印模法对KT-Ⅰ层原始沉积古地貌和后期溶蚀古地貌进行了恢复,指出了M区块原始沉积古地貌高地与溶蚀斜坡带叠合区为有效白云岩储层分布区,提出了M区块勘探方向为"向南扩大勘探场面,向东拓展勘探新区",在中-南部和南部建议了3口井位,取得了很好的钻探实效.表明古地貌恢复技术是M区块预测白云岩储层的有效方法.The development of dolomite reservoirs is mainly influenced by primary sedimentary lithology and later dissolution action,whereas the primary sedimentary lithology is controlled by pre-depositional paleogeomorphology and the dissolution ac-tion is controlled by karst-geomorphology.In M Block,the favorable reservoir rock of KT-Ⅰ is dissolution dolomite and is dis-tributed in the upper formation,with its pore types mainly including intercrystalline pores,intercrystalline solution pores,in-tergranular solution pores and organic visceral pores.The paleogeomorphology in Carboniferous in M Block is featured with“higher in west and lower in east”and “lower in west and higher in east”in Early Permian,with the eroded top formation of KT-Ⅰ.This study applies residual thickness method and mould method for recovery of the pre-depositional paleogeomorpholo-gy and the karst-geomorphology respectively,and suggests the favorable area of dolomite reservoirs occurs in the overlap zone of the pre-depositional paleogeomorphology highland and karst-slope zone,and it is further suggested that exploration area for potential dolomite reservoirs is to be extended southward and eastward.Three appraisal wells in central-southern and southern areas yield good results.The study shows the paleogeomorphology recovery technique is effective for predicting dolomite reser-voir in M Block.

关 键 词：白云岩储层 古地貌恢复 原始沉积古地貌 溶蚀古地貌 滨里海盆地 石油地质 

分 类 号：P618[天文地球—矿床学]