塔里木盆地塔中南缘中2井良里塔格组沉积亚相研究

AN APPROACH TO MICROFACIES ANALYSIS FOR CARBONATE ROCK IN LIANGLITAGE FORMATION OF THE UPPER ORDOVICIAN, SOUTHERN MARGIN OF KETAKE UPLIFT, TARIM BASIN

钱一雄 刘忠宝 蔡习尧 陈强路 苏绢 陈跃

Qian Yixiong Liu Zhongbao Cai Xiyao Chen Qianglu Su Juan Chen Yue

中国石油化工股份有限公司 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214151 2. 中国石油化工股份有限公司 石油勘探开发研究院 西部勘探中心, 乌鲁木齐 830011

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China 2. Northwest Institute, SINOPEC Exploration & Production Research Institute, Urumqi, Xinjiang, 830011, China

塔里木盆地卡塔克隆起南坡是否发育类似于北坡I号带坡折带的良里塔格组礁滩相是值得关注的基础地质问题。该文对中2井良里塔格组取心段进行了沉积亚(微)相详细分析。总结了含生屑藻团粒的粒泥灰岩、苔藓虫及四分珊瑚格架岩或障积岩等6个亚相和礁—滩、(礁)—滩—丘、粒屑滩、滩—(藻)席、灰泥丘—(藻)席、藻席—低能带6种沉积亚相组合;自下而上,4个取心段由一个向上变深、一个震荡和2个总体向上变浅的沉积过程组成,前三回次表现为粒屑滩、灰泥丘(藻席)、骨架礁亚相的多旋回垂向组合,以高位进积滩(礁)相为主和海侵期退积的台地滩(礁)—台地沉积为主。

It is a basic geologic issue whether the Lianglitage Formation of the Upper Ordovician,southern margin of Ketake Uplift,Tarim Basin,is or not consists of sedimentary assemblage of reef-shoal,just likely to counterparts that occurs in northern margin of Ketake Uplift.Based on the microfacies analysis of carbonate rocks in the cored intervals of Lianglitage Formation in Well Zhong-2,six microfacies records of bioclastic-bearing algal pellet micritic,bryozoans and coralline framestone,bindstone,bafflestone have been recognized,as well as of six major stacking patterns of reef-shoal,reef-shoal-mound,coarse pellet shoal,beach-algal mats,algal or bioherm mound-algal mats,algal mats-subtidal low energy.From lower to upper cored intervals of Lianglitage Formation,the vertical facies distribution are respectively indicative of a gradual deepening trend,a sea-leval fluctuation and two shallowing upward succession carbonate cycles,and account for a serial of stacking pattern of pellet shoal,algal or bioherm mound and reef framestone in the first three cored intervals,with the prominent of highstand progressive system tracts of reef-beach and retrograde terrace reef-shoal developed during sea-level rising period.

国家重点基础研究发展计划(973计划)资助(2005CB422100);国家专项(2008ZX05005-002-001)资助

https://doi.org/10.11781/sysydz201004341