塔中北坡顺托果勒地区志留系油气成藏期差异性分析
Differences of Hydrocarbon Accumulation Periods in Silurian of Tazhong Northern Slope, Tarim Basin

塔中顺托果勒地区经历了多期构造活动，使顺10和顺9井区油气成藏过程具有一定的差异性.前人采用多种技术方法对研究区志留系成藏时期进行了深入研究，但尚未达成共识.以储层成岩作用和成岩序次分析为基础，采用显微红外光谱、显微荧光、冷阴极光等手段，对储层沥青、原油和单个油包裹体进行了系统分析，并结合埋藏史投影法确定了研究区志留系柯坪塔格组顺10和顺9井区等油气充注序次和成藏时间.结果表明，顺9井区存在3期油和1期天然气充注，加里东晚期(419.6～398.1 Ma)、海西晚期(271.5～224.0 Ma)和喜山期(11.4～1.1 Ma)；顺10井区可能只存在加里东晚期(419.6～408.4 Ma)和海西晚期(271.6～236.8Ma)油充注，缺乏晚期油气充注.顺9井区3D地震剖面层位和断裂解释显示，塔中北坡NE向走滑断裂是志留系油气运移的重要输导体系，并控制了柯坪塔格组晚期油气充注，决定了该区工业油流.因此，塔中北坡志留系油气勘探的关键是寻找喜山期充注的油气藏.
Hydrocarbon accumulations of Silurian had obvious differences between shun 10 and shun 9 well blocks due to the influence of multi-cycle tectonic activity in Shuntuoguole area of Tarim basin. Researchers used a variety of technical methods to conduct an in-depth study of the Silurian accumulation period in the study area, but no consensus has yet been reached. On the basis of diagenesis and diagenetic sequences, hydrocarbon filling sequence and charging history in shun 10 and shun 9 well blocks are determined by fluid inclusion system analysis and burial history projection combined with micro FT-IR, microscopic fluorescence and cathodeluminescence analysis in this study. Results show that the shun 9 well block displays three oil-charging stages including Late Caledonian (419.6-398.1Ma), Late Hercynian (271.5-224.0Ma) and the Himalayan (11.4-1.1Ma), while shun 10 well block displays only two oil-charging stages including Late Caledonian (419.6-408.4Ma) and Late Hercynian (271.6-236.8Ma). 3D seismic interpretation of strata section and faults in shun 9 well block shows that, NE strike-slip faults in Tazhong northern slope are important migration system for hydrocarbon migration in the Silurian, which determines the industrial oil output in this area. Hence, the key target for hydrocarbon exploration in the Silurian lies in reservoirs charged in the Himalayan