新疆三塘湖盆地马朗凹陷石炭系原油形成过程及勘探意义  

Crude Oil Forming Processes and Exploration Significance of Carboniferous in Malang Sag, Santanghu Basin

作　　者：吴红烛[1,2] 黄志龙[1] 张成林[1] 涂小仙 罗权生 孔宏伟 范谭广 张新顺[4] 

机构地区：[1]中国石油大学 油气资源与探测国家重点实验室,北京102249 [2]浙江省地球物理地球化学勘查院,杭州310005 [3]中国石油吐哈油田分公司,哈密839009 [4]中国石油勘探开发研究院,北京100083

出　　处：《高校地质学报》2015年第1期124-130,共7页Geological Journal of China Universities

基　　金：国家自然科学基金项目(41272156)

摘　　要：新疆三塘湖盆地马朗凹陷牛圈湖构造带马25井石炭系火山岩储层中发现了原油和固体沥青共存,通过储层多级分离抽提和原油地球化学分析,并对这些原油(或固体沥青)的形成过程与其勘探意义进行了研究,结果表明这些原油和沥青可能主要来自下石炭统烃源岩,具有较低姥植比和伽玛蜡烷含量、高丰度三环萜、高Ts/Tm比值和重族组分碳同位素(δ13C>-28.0‰)特征;现今油藏原油富含生物降解标志物(25-降藿烷),同时却无明显其它生物降解特征(正构烷烃、甾藿烷等保存完整),反映多期充注特征,即二叠纪中晚期成藏后遭受生物降解,白垩纪后期又再次充注形成;下石炭系有效烃源岩的存在预示着本区具有深部下石炭统源岩贡献的油气藏勘探前景。Crude oil and solid bitumen coexist in the volcanic reservoirs of the Well Ma25 in the Niuquanhu structure zone in the Malangdepression in the Santanghu Basin, Xingjiang. Through multistage separation and extraction, and geochemical analysis of the reservoirs,the formation processes and exploration significance of these crude oil（or solid bitumen） have been discussed. The results show that thecrude oil / bitumen may mainly come from the source rocks of Lower Carboniferous, with lower Pr/Ph and gammacerane index, highabundance of tricyclic terpane, high Ts/Tm ratio and the heavy aromatic component carbon isotope（δ^13C〉-28.0‰）. Crude oil in thereservoirs is now rich in biological degradation markers（25-norhopane） with no other significant biodegradation characteristics（n-alkanes, steranes and hopanes is intact）, reflecting the characteristics of the multi filling stages, that is, oil reservoirs sufferedbiodegradation after accumulation in the Late Permian and were filled again in the Late Cretaceous. The existence of the LowerCarboniferous source rocks in this area indicates that there are potentials for oil and gas exploration from reservoirs in the deep LowerCarboniferous source rocks.

关 键 词：原油碳同位素 生物标志物 生物降解 马朗凹陷 新疆三塘湖盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]