塔河油田奥陶系天然气地球化学特征、成因及运移充注规律研究  

Geochemistry,genetic type and migration and filling of Ordovician natural gas in Tahe oilfield

作　　者：王杰[1,2] 顾忆[3] 饶丹[3] 楼章华[1] 

机构地区：[1]浙江大学理学院地球科学系 [2]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 [3]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

出　　处：《地球化学》2007年第6期549-558,共10页Geochimica

基　　金：中国石油化工股份有限公司西北分公司资助项目(05-213501-3)

摘　　要：塔河油田奥陶系天然气主要以烃类气体为主,甲烷占绝对优势,绝大部分天然气重烃含量较高,非烃气体以N2和CO2为主,含有一定量的H2S。塔河奥陶系天然气具有相同母质来源,为不同成熟度油型气的复合,二氧化碳气体为碳酸盐岩热变质作用产生。塔河奥陶系天然气的生成具有多阶连续的特征,既有反映成熟阶段的正常原油伴生气和较高成熟阶段的凝析油伴生气,又有反映高过成熟阶段的高温裂解气。主体区奥陶系天然气具有两期充注、两期混合的特征。早期充注的为典型原油伴生气,充注方向为从东南向西北,从东向西;晚期充注的为高温裂解气,充注方向为从东向西。还对两期主要天然气充注的范围进行了初步厘定。The hydrocarbon gases are in the great majority in volume of the Ordovician natural gases in Tahe oilfield, in which methane is absolutely dominant. Heavy hydrocarbon gas abundant is relatively high in a majority of natural gases, and the main components of non hydrocarbon gases are N2 and CO2, containing a little quantity of hydrogen sulfides. The Ordovician natural gases originated from the same source rocks, which are the complex of the different maturity stage gas. Carbon dioxide was produced by the thermal metamorphism of carbonate rocks. The generating natural gases of different stages have continuous characteristics, which contain petroleum associated gas of the maturity stage and condensate associated gas of the relatively high maturity stage, as well as cracking gas of high-over maturity stage. In the main part of the Tahe area, the Ordovician natural gases indicate two phases of filling and two phases of migration. The gas filled in the early phase is typical petroleum associated gas with a filling direction from southeast to northwest and from east to west, and the gas filled in the late phase is cracking gas with a filling direction from east to west. At the same time, the filling scopes of the main gases of the two phases are discussed.

关 键 词：奥陶系 天然气 同位素组成 成因类型 运移充注 塔河油田 

分 类 号：P593[天文地球—地球化学]