苏北管镇次凹低成熟原油的地球化学特征  

Geochemical Feature of Low-Mature Crude Oil in Sub-Sag of Guanzhen in Subei Basin

作　　者：杨斌[1,2] 梁兴 马孝祥 周松源 楼基胜 蔡雅萍 

机构地区：[1]中国石油勘探开发研究院杭州地质研究所,杭州310023 [2]中国石油浙江油田分公司,杭州310023

出　　处：《新疆石油地质》2008年第5期553-556,共4页Xinjiang Petroleum Geology

摘　　要：管镇次凹位于苏北盆地盐阜坳陷洪泽凹陷中部,本区原油为低成熟油。其原油物性具有"四高一低"特点,即中等偏高的原油密度,高粘度,高凝固点,高含蜡量,低含硫;管镇次凹各井原油未经生物降解,其族组分具有典型低成熟油的特征;原油轻烃热演化程度数据表明,其轻烃热演化程度较低;原油中具有较低的m(Pr)/m(Ph)值和较高的m(Ph)/m(nC18)值,这也被认为是低成熟原油的一个强有力的证据;甾烷热演化比值也都具有典型的低成熟原油的特征。原油的姥/植比值表明为还原-强还原环境的产物。该原油源自以腐泥型为主的母质显示了以腐泥型为主的母质特征。本区原油含蜡量高,其高含蜡是与低熟阶段部分腐殖型干酪根成油和腐泥型干酪根中的丛粒藻早期成油有关。The sub-sag of Guanzhen is located in middle part of Hongze sag in Yanfu depression, Subei basin. Its low-mature crude oil is characterized by the ＂four highs and one low＂ physical properties： the middle-higher crude density, high viscosity, high solidification point, high paraffin content and low sulfur content. The oils in wells in this sub-sag are not subjected to biodegradation, with the typical low-mature oil feature of their group compositions, which are proved by low degree of the thermal evolution data of light hydrocarbons including sterane, low m（Pr）/m（Ph） and high m（Ph）/m（nC18） ratios. The m（Pr）/m（Ph） ratio indicates the crude is product from the reductingstrong reducting environment and dominated by sapropelic kerogen. The high paraffin content of crude oils is related to those that a part of humic kerogen formed oil in low-mature stage and botryococcane in saprogelic kerogen early formed oil.

关 键 词：苏北盆地 洪泽凹陷 地球化学 古近系 低成熟油 

分 类 号：TE112[石油与天然气工程—油气勘探]