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通过对地质、地球化学等资料的研究，认为塔里木盆地志留系沥青砂岩有５种成因类型：①表生－浅层氧化沥青是指在油层露头区或油层位于近地表处，由于挥发、氧化、水洗和生物降解等作用而形成的一些焦油状沥青质重油以及固体浅层氧化沥青或硬质沥青。②储层分异沥青系指在油气二次运移的汇聚区，呈珠状或链状的烃类在运移和聚集过程中因储层物性变化重质组分滞留和轻质组分散失而形成的沥青或稠油。③蒸发分馏沥青是指晚期生成的轻质石腊族烃与早期生成的正常原油或稠油相混，造成不稳定状态，造成沥青从液态石油中析出。④水洗沥青系指油层或油气藏底（油水过渡带）因水洗作用而形成沥青或稠油。⑤热变质沥青目前在该盆地确认为热突变沥青，即由火成岩活动热烘烤而形成的沥青。
Through the study of geology, geochemistry and other data, it is considered that there are five genetic types of Silurian astigmatite in the Tarim Basin: (1) epiphytic - shallow oxidized asphalt means that in the outcrops of oil reservoirs or oil reservoirs near the surface due to volatilization, oxidation , Water washed and biodegradable role of the formation of some of the tar-like heavy oil and solid shallow asphalt or rigid asphalt. (2) Differential reservoirs in reservoirs refer to the accumulation of heavy components and the loss of light components due to changes in physical properties of reservoirs during the migration and accumulation in the pooling zone where oil and gas migrate secondarily. The formation of asphalt or heavy oil. ③ Evaporative distillation of asphalt refers to the late generation of light paraffin hydrocarbons and early generation of normal crude oil or heavy oil mixed, resulting in an unstable state, resulting in bitumen from liquid petroleum precipitation. ④ washing asphalt refers to the reservoir or reservoir at the end (oil and water transition zone) due to the role of washing and the formation of asphalt or heavy oil. ⑤ thermal deterioration of the bitumen is currently recognized in the basin as a hot mutant asphalt, which is formed by bitumen firing igneous activity.