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碳酸盐岩表生岩溶与埋藏溶蚀比较——以塔北和塔中地区为例

作    者:钱一雄1,Conxita Taberner2,邹森林1,尤东华1,王蓉英3
单    位:1 中国石化石油勘探开发研究院西部分院;2 Institut de Cie魣ncies de la Terra;3 中国石化西北分公司勘探开发研究院
基金项目:国家重点基础研究发展规划(973)项目(编号:2005CB422100)等资助
摘    要:
表生岩溶与埋藏溶蚀是碳酸盐岩储层发育的最重要成岩作用,两者受岩石等内在因素的影响基本相同,但所受的外部主控因素差异显著。表生岩溶受构造不整合面、古构造等影响较大;埋藏溶蚀主要受断裂与深部流体控制。表生岩溶主要表现为垂向分带性明显的复杂孔洞缝网络结构,而埋藏溶蚀主要呈受断裂—裂隙控制的“V”形洞穴样式或与断裂有关的阶梯状分布。表生岩溶发育一些标型特征,如钙质壳,古土壤,铝土矿,淡红色方解石晶体,溶蚀沟、坑、天坑,新月形状、悬垂和纤维状渗滤砂或胶结物,岩溶角砾及与地下暗河有关的机械流水沉积;埋藏溶蚀往往发育与中低温热液有关的异形铁白云石、萤石、闪锌矿、磁黄铁矿等密西西比河谷型矿物以及塌陷构造、裂隙结构、不规则的角砾(化)岩体等。塔里木盆地塔北地区主要发育表生岩溶作用;塔中地区西北部不具备发育大规模表生岩溶的地质条件,以发育埋藏溶蚀作用为主。
关键词:奥陶纪;碳酸盐岩;表生岩溶作用;埋藏溶蚀作用;塔里木盆地

Diagenesis Comparison between Epigenic Karstification and Burial Dissolution in Carbonate Reservoirs: An Instance of Ordovician Carbonate Reservoirs in Tabei and Tazhong Regions,Tarim Basin

Author's Name: Qian Yixiong, Conxita Taberner, Zou Senlin, You Donghua, Wang Rongying
Institution: Western Institute, Exploration & Production Research Institute, SINOPEC
Abstract:
Epigenic karstification(EK) and burial dissolution(BD) that are the most important diagenesis in carbonate rocks are similar in undergoing effect of the inner factors such as petrology and composition but great different in effect of the outer controlling factors. EK is predominantly controlled by the development of unconformity and paleostructurses while BD is controlled by the distribution of faults and deep-seated fluids. EK is characteristic of com-plex reservoir network of pores,vugs and fissures with distinguishing vertical zone distribution while BD features in distribution of linear V-shaped caverns and terraces. EK develops some features of typominerals such as calcium crust, paleo-soil, bauxite, rosiness calcite crystals, dissolved pits and ditchs and fallen caverns and karst breccia even as well as lunate, vertical and fibrous infiltration sands or cements; while BD is characteristic of MVT minerals including heteromorphic Fe-dolomite, fluorite, sphalerite and pyrrhotite, as well as collapsed structure, fissured tex- tures and irregular breccia rock bodies. EK develops generally in Ordovician carbonate reservoirs in Tabei region, in- cluding the famous Tahe Oil Field, and BD are common in Ordovician carbonate reservoirs in northwestern Tazhong region where the geological condition of wide-developing EK is absent.
Keywords: Ordovician; Carbonate rock; Epigenic karstification; Buried dissolution; Tarim basin
投稿时间:2006-08-30  
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