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利用准噶尔盆地吉木萨尔凹陷芦草沟组地质、试油、录井、岩石薄片及地球化学等资料,研究了致密油的形成条件、分布特征及其控制因素。研究区致密油形成条件优越,烃源岩有机质丰度高、有机质类型为Ⅰ和Ⅱ型并且为低熟-成熟阶段;储层岩性复杂,甜点段平面连续性好,孔隙类型多样;广泛分布的烃源岩与储层频繁互层,烃源岩生成的油气直接进入相邻储层,有利于致密油的富集;芦草沟组超压广泛发育,是致密油运移的主要动力。致密油纵向上分布受优质烃源岩控制,全段均见油气显示,主要富集于优质烃源岩层附近的储层中;平面上受烃源岩有机质丰度、烃源岩厚度及储层厚度的综合控制,主要分布于烃源岩厚度大于200 m、TOC高于3.5%、储层厚度大于15 m的区域之内。
The formation conditions, distribution characteristics and controlling factors of tight oil were studied by using the data of Lucaogou Formation in Gejiasal Sag, Junggar Basin, such as geology, oil testing, logging, rock flake and geochemistry. The tight oil formation conditions in the study area are superior. The hydrocarbon source rocks have high abundance of organic matter, type I and type II of organic matter, and low maturity-mature stage. The reservoir lithology is complex, the continuity of the dessert section is good, and the pore types are diverse. Of the source rocks frequently interbedded with the reservoirs. The hydrocarbon generated from the source rocks directly enters the adjacent reservoirs, which is favorable for the enrichment of tight oil. The overpressure of the Lucaogou Formation is widely developed, which is the main driving force for the tight oil migration. The vertical distribution of tight oil is controlled by high-quality source rock. The whole section shows oil and gas and is mainly concentrated in reservoirs near the high-quality source rock. The plane is affected by organic matter abundance, source rock thickness and reservoir The comprehensive control of thickness is mainly distributed in the area where the source rock thickness is more than 200 m, the TOC is more than 3.5% and the reservoir thickness is more than 15 m.