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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。
Based on the analysis of the ethnic composition of the crude oil in Chepaizi area, it is found that not only the asphaltene is not contained in the undegraded light oil, but also the asphaltene in some heavy oil, which is similar to the common asphaltene content in heavy oil High features are significantly different. According to the different asphaltene contents, the crude oil and oil sands in Chepaizi area are divided into four categories: the first is light oil without asphaltene, the latter is high mature oil and gas; the second is heavy oil without asphaltene, Light oil-soluble heavy oil washing formation; the third category is rich in asphaltene heavy oil, early crude oil-heavy crude oil reservoir was light oil residue was dissolved; the fourth category is asphaltene content of heavy oil, as After the light oil filling heavy oil thinning migration formation and migration. The main reason for the large difference in the oil-gas asphaltene content is the large difference in the nature of oil and gas during different filling periods in the area. Early mature normal-mature crude oil forms shallow oil that is rich in non-hydrocarbon and asphaltene, Note that light oil has weak ability to dissolve asphaltenes, and can not dissolve and transport asphaltenes during charging. The selective dissolution of this light oil on early heavy oil components is the intrinsic factor that causes the huge difference in the nature of the crude oil in Chepaizi area. The distribution of crude oil with different asphaltene contents in Chepaizi area shows that the light oil in this area is longitudinally penetrated through the faults in the deep position of the Sikeshu sag and entered into the sediments with early heavy oil and heavy oil In contrast, the light oil migrated through the heavy oil migration channel selectively dissolved and transported the different components in the early heavy oil, resulting in the large difference in oil and gas properties in the Chepaizi area at present, Under the thick special phenomenon.