塔中东部地区上奥陶统良里塔格组同生期岩溶作用识别标志、发育特征及发育模式  

Recognizable Indicators, Paleokarst Characteristics and Development Patterns of Upper Ordovician Lianglitage Formation in Eastern Tazhong Area, Tarim Basin, NW China

作　　者：张兴宇 屈海洲[1] 张云峰[1] 汤兴宇 王振宇[1] 罗新生 雷银 张敏[3] 裴钰[5] 

机构地区：[1]西南石油大学地球科学与技术学院,四川 成都 [2]中国石油西南油气田公司川西北气矿,四川 江油 [3]中国石油塔里木油田分公司勘探开发研究院,新疆 库尔勒 [4]中国石油西南油气田分公司工程技术研究院,四川 成都 [5]川庆钻探工程有限公司,四川 成都

出　　处：《地球科学前沿（汉斯）》2022年第3期356-365,共10页Advances in Geosciences

摘　　要：基于塔中东部地区良里塔格组沉积和构造背景,利用岩心、薄片、测井、阴极发光、电子探针等手段和资料,研究塔里木盆地塔中东部地区良里塔格组的同生期岩溶作用的识别标志、发育特征及发育模式。研究表明,同生岩溶发育于良里塔格组沉积中晚期,以具组构选择性的溶蚀孔隙(洞)、示顶底构造、悬垂形和新月形大气淡水胶结物等为基本特征。大气淡水成岩透镜体在垂向上可分为大气淡水渗流带、大气淡水潜流带、海水潜流带,有效溶蚀孔隙多见于大气淡水渗流带及潜流带顶部,其下胶结作用显著增强。研究区内井上普遍发育4~6大气淡水成岩透镜体,具明显的纵向叠加特征,单期次成岩透镜体厚度一般为10~40 m,总厚度110~150 m。多期的礁滩体营建和海平面频繁升降控制了研究区同生岩溶的发育,在研究区内呈透镜状平行于塔中Ⅰ号构造带分布,反映了台缘高能相带控制的岩溶作用模式。Based on the sedimentary and structural background of Lianglitage Formation in the east of cen-tral Tarim Basin, the identification marks, development characteristics and development model of syngenetic karstification of Lianglitage Formation in the Middle East of Tarim Basin are studied by means of core, thin section, logging, cathodoluminescence and electron probe. The study shows that syngenetic karst developed in the middle and late stage of Lianglitag formation sedimentation, and is basically characterized by fabric selective dissolution pores (caves), top and bottom structures, suspended and crescent atmospheric fresh water cements. The diagenetic lens of atmospheric fresh water can be vertically divided into atmospheric fresh water seepage zone, atmospheric fresh water subsurface flow zone and seawater subsurface flow zone. The effective dissolution pores are mostly found at the top of atmospheric fresh water seepage zone and subsurface flow zone, and the cementation under them is significantly enhanced. In the study area, 4~6 atmospheric fresh water diagenetic lenses are generally developed on the wells, with obvious vertical superposition characteristics. The thickness of single-stage diagenetic lenses is generally 10~40 m and the total thickness is 110~150 m. The multi-stage reef beach construction and frequent rise and fall of sea level control the development of syngenetic karst in the study area. It is lenticular and parallel to Tazhong I structural belt in the study area, reflecting the karstification mode controlled by the high-energy facies belt on the platform margin.

关 键 词：岩溶作用 良里塔格组 同生岩溶 塔中地区 礁滩相 

分 类 号：P618[天文地球—矿床学]