塔里木盆地巴麦—塔中地区晚古生代古构造演化及油气成藏分析  

Neopaleozoic tectonic evolution and hydrocarbon analysis in Bamai-Tazhong area,Tarim Basin

作　　者：郭倩[1] 蒲仁海[2] 

机构地区：[1]西北大学大陆动力国家重点实验室,陕西西安710069 [2]西北大学地质学系,陕西西安710069

出　　处：《石油地球物理勘探》2011年第2期317-325,164,共9页Oil Geophysical Prospecting

基　　金：中石化海相前瞻项目--塔里木盆地古生代古构造古环境及其动态演化

摘　　要：本文基于钻井和地震资料绘制的巴麦—塔中地区上古生界古构造图,通过恢复巴麦—塔中地区的上古生界沉积厚度,阐述了油气进入储层后由古构造低部位向高部位运移的动态演化过程,了解了该区油气离开烃源岩或烃源岩区以后的运聚、聚集和散失情况。研究得到以下认识:①晚古生代时期巴麦—塔中地区隆、拗格局与现今相比有较大差异,巴楚隆起和塔中隆起在晚古生代已初步形成,石炭纪时两者呈北西向展布,塔中古隆起高点比现今隆起高点更偏西,两个隆起之间的和田河地区现今构造是一个低隆,但晚古生代时期却曾是古拗陷和鞍部,研究区南部南西倾的麦盖提斜坡在海西期是一个西深东浅的东西向拗陷;②东河砂岩顶面的古构造形态演化表明,满加尔拗陷生成的油气在白垩纪末期以前向北运移,无法在塔中隆起聚集,在新近纪以后才向南运移,被塔中隆起高点1号带和10号带的圈闭捕获形成油气藏,而构造较低的塔中隆起南坡圈闭无法捕获满加尔拗陷的油气,这可能是该区许多探井失利的原因;③麦盖提斜坡北部—和田河低凸是塔西南拗陷多构造期油气运移聚集区,塔中隆起高点及北侧是满加尔拗陷喜山期油气供给聚集区,塔中隆起东端是油气运移最终指向区,也是东河砂岩上倾尖灭带,以上区域存在多套储盖组合,是巴麦—塔中地区的有利勘探区。From a paleostructure map of Bamai-Tazhong area in Tarim Basin based on drilling information and seismic data,and through the restoration of Neopaleozoic deposit thickness in Bamai-Tazhong,this paper elaborates that hydrocarbon,after entering reservoir,migrated from the ancient structure nose shaped salient to pitch up direction,and that the hydrocarbon migration,accumulation and dissipation were revealed after leaving source rocks or source rock area.The observations are obtained as follows: 1.The ancient uplift and depression pattern of Bamai-Tazhong in Neopaleozoic period was very different from nowadays,these two uplifts were preliminarily formed during Neopaleozoic,and had the NW extension direction during Carboniferous.The high point of Tazhong uplift was further west than the present time.Hetian River area between these two uplifts is now a low uplift,but it used to be an ancient depression and saddle.The SW Maikit slope was a WE depression which extended deeper from west to east.2.The top surface tectonic evolution of Donghe sandstone show that oil and gas generated in Manjiaer depression migrated to north before latest cretaceous,failed to accumulate in Tazhong uplift.Hydrocarbon migrated to south after neogene and was captured into reservoirs at the No.1 and No.10 high traps in Tazhong uplift,while low structure traps in the south slope of Tazhong uplift could not get hydrocarbon.This probably is the reason for a few dry holes.3.The north Maikit slope and Hetian River low uplift were migration and accumulation areas of multi-struture period.The high structure and the north side of Tazhong uplift were provision and accumulation areas to Manjiaer depression during himalayan period.The eastern area of Tazhong uplift was the final migration oriented area and also the updip pinch-out zone of Donghe sandstone,which consists of multiple sets of reservoirs,a favorable exploration area in Bamai-Tazhong.

关 键 词：塔中隆起 巴楚隆起 麦盖提斜坡 晚古生代 构造演化 剥蚀厚度恢复 油气运移 

分 类 号：P631[天文地球—地质矿产勘探]