CAJ | 학술논문

依奇克里克油田位于库车坳陷东部阳霞凹陷的北部.通过对依南5井不同深度储层所产原油地球化学特征的系统分析发现,浅层原油的轻烃几乎不含苯系芳烃,其三环萜烷系列以C_(23)为主峰,C_(24)四环萜烷含量低,伽马蜡烷含量较高,甾烷系列中C_(27)和C_(28)甾烷含量高,重排甾烷含量较低,显示咸水环境海相原油的特征.鉴于该原油中同时检测出了25-降藿烷系列,表明该原油是生物降解油与正常原油的混合油.而深部储层所产原油的轻烃中苯系芳烃丰富,三环萜烷以C_(19)为主峰,C_(24)四环萜烷含量极为丰富,伽马蜡烷含量极低,甾烷系列中C_(29)甾烷占绝对优势,显示淡水湖沼相原油的特征.结合塔里木盆地不同成因类型原油的地球化学特征,推测依南5井不同深度所产原油存在这一差异的原因是浅层原油属于早期生物降解海相原油与晚期侏罗系湖沼相原油的混源油,而深部原油属于侏罗系烃源岩单一来源的原油.
의기극리극유전위우고차요함동부양하요함적북부.통과대의남5정불동심도저층소산원유지구화학특정적계통분석발현,천층원유적경경궤호불함분계방경,기삼배첩완계렬이C_(23)위주봉,C_(24)사배첩완함량저,가마사완함량교고,치완계렬중C_(27)화C_(28)치완함량고,중배치완함량교저,현시함수배경해상원유적특정.감우해원유중동시검측출료25-강곽완계렬,표명해원유시생물강해유여정상원유적혼합유.이심부저층소산원유적경경중분계방경봉부,삼배첩완이C_(19)위주봉,C_(24)사배첩완함량겁위봉부,가마사완함량겁저,치완계렬중C_(29)치완점절대우세,현시담수호소상원유적특정.결합탑리목분지불동성인류형원유적지구화학특정,추측의남5정불동심도소산원유존재저일차이적원인시천층원유속우조기생물강해해상원유여만기주라계호소상원유적혼원유,이심부원유속우주라계경원암단일래원적원유.
The geochemical characteristics of crude oils from YN5 well in Yiqikelike Oilfield located at the northern Yan gxia Sag of East Kuqa Depression, was analyzed and studied.The results show that in the light hydrocarbon of the crude oils from shallow reservoir, benzene series aromatics is almost absent, C_(23) is a maximum peak in tricyclic terpane scries and C_(24) tetracyelic terpane is very low, the relative abundance of gammacerae is higher. In sterane series, their relative abundance is C_(27)R<C_(28) R<C_(29) R, and diasterane is very lower, indicating that it has the characteristics of marine oils in Tarim Basin. In addition, 25-norhopane series, an indicator of severe biodegradation of crude oil, are identified in the crude oil. As for the crude oils from deeper reservoir, in its light hydrocarbon, benzene aromatic compounds are very abundant, C_(19) is a maximum peak in tricyclic lerpane series and C_(24) tetracyelic terpane is very abundant, gammacerae is almost absent. In its sterane series, C_(29) sterane is most abundant, and diasterane is relatively higher, indicating that it is characteristic of coal measure source rocks in Kuqa Depression. Therefore, based on their geochemical characteristics, the crude oil form shallow reservoirs is a mixed oil between the biodegraded marine oil and the oil derived from Jurassic coal measures, and the crude oils from deeper reservoir is derived from Jurassic coal measures.