沥青质含量在车排子地区油气成藏研究中的应用  

Application of asphaltene content for study of oil and gas accumulation in Chepaizi area

作　　者：张学军[1,2] 徐兴友[2] 邢丽雯[3] 韩冬梅[2] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《油气地质与采收率》2013年第4期25-29,112,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"渤海湾盆地精细勘探关键技术"(2011ZX05006-001)

摘　　要：通过对车排子地区原油的族组成分析,发现该区不仅未降解的轻质油中不含沥青质,在部分稠油中也不含沥青质,这与稠油中常见的沥青质含量较高的特征明显不同。根据沥青质含量不同将车排子地区原油及油砂分为4类:第1类为不含沥青质的轻质油,是晚期高成熟油气;第2类为不含沥青质的稠油,为轻质油溶洗稠油形成;第3类为富含沥青质的稠油,为早期原生稠油油藏被轻质油溶洗残余;第4类为沥青质含量中等的稠油,为轻质油充注后稠油稀化运移溶解运移形成。造成油气沥青质含量差异较大的主要原因是该区不同充注期次油气性质差异较大,早期成藏正常成熟原油因埋藏浅降解后形成富含非烃和沥青质的稠油,后期充注的轻质油对沥青质的溶解能力弱,充注过程中不能溶解和运移沥青质。这种轻质油对早期稠油组分的选择性溶解是造成目前车排子地区原油性质巨大差异的内在因素。车排子地区不同沥青质含量原油的分布结果表明,该区轻质油在四棵树凹陷深部位的断层处发生纵向穿层运移,分别进入了含早期稠油和不含稠油的运移通道,经过含稠油运移通道的轻质油对早期稠油中不同组分选择性地进行了溶解运移,从而造成目前车排子地区油气性质差异大,且原油纵向上呈现上稀下稠的特殊现象。Through the group composition analysis of the oils in Chepaizi area,it is found that the asphalene components are absent not only in the light oil without degradation,but also in some heavy oils,obviously different from the common heavy oil with higher asphaltene content.According to the asphaltene content,the crude oils in Chepaizi area are divided into four types:the first is the light oil without asphaltene,accumulated lately with high maturation;the second is the heavy oil rich in asphaltene,left from the native heavy oil dissolved by the light oil;the third is the heavy oil without asphaltene,dissolved and migrated with the light oil;the fourth is the heavy oil with medium content of asphaltene,diluted and migrated with the light oil in early stage.The main reason accounting for major asphaltene content difference is the different properties of oil at different migration stage.The normal mature oil developed the heavy oil rich in asphaltene and nonhydrocarbon at early stage,and the dissolving capability of light oil infused at later stage for asphaltene is low,and there is no dissolving and migration at later infusing stage.The regulating function of light oil is the intrinsic factor for the tremendous divergence of the oil character in Chepaizi area.The light oil emerged portrait transformational migration at deep fault in Sikeshu sag,and entered into migration pathway including the heavy oil early stage or without heavy oil separately.The main migration is along the layers at slope place.The selective adjustment of the light oil in migration pathway with heavy oil formed the special phenomenon that the oil distributing is light oil on top and heavy oil down in Chepaizi area.

关 键 词：沥青质含量族组成 轻质油 成藏规律 车排子地区 

分 类 号：TE112.31[石油与天然气工程—油气勘探]