• 责任者：Cheng Honggang (Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals ; Qingdao 266510 ; China) ; Wei Guoqi
• 刊名：Natural Gas Industry
• 出版年：2013
• 卷期：33(10)
• 关键词：油气藏 ; oil and gas reservoir ; 地沥青 ; bitumen ; 塔里木盆地 ; Tarim Basin
• 页码：p.40-46
• 图表：5 illus., 1 table, 27 refs.
• 分类号：1003
• issnNo：ISSN1000-0976
• isbnNo：CN51-1179/TE

     Solid bitumen is well developed in the Lower Paleozoic in the eastern Tarim Basin. As solid bitumen is the product of crude oil cracking, its characteristics and periods of formation are indicative of the hydrocarbon generation and migration in the study area. Through analyzing its accumulation forms, occurrences, types, content and distribution, we divided the solid bitumen in the Lower Paleozoic there into two types： insitu bitumen and reservoir bitumen. Seven subtypes were further identified according to their occurrences. The content of solid bitumen is not high as a whole in the study area. The insitu bitumen is mainly distributed in the carbonaceous mudstones, while the reservoir bitumen mainly occurs in carbonates. The insitu bitumen mainly occurs in the Lower Paleozoic, while the reservoir bitumen only occurs in the Upper Cambrian dolomites and the MidLower Ordovician limestones. In general, the content of bitumen is the highest in the Cambrian. According to the characteristics of reflectivity, there are different phases of solid bitumen in different tectonic units of the region. One is the singlepeak bitumen, which is only influenced by the sedimentation and mainly distributed in Kurle noseuplift and west of Lop Nor noseuplift. The other is the dualpeak bitumen, which is influenced by the sedimentation and one tectothermal event, and is mainly distributed in the Yingjisu sag and the area to its southeast. The third is the tripeak even multiplepeak bitumen, which is influenced by the sedimentation and two tectothermal events, and is mainly distributed in Gucheng noseuplift and Tadong low uplift. It is concluded that not only palaeooil reservoirs possibly occurred in the Lower Paleozoic in the uplift zones and slope zones of the eastern Tarim Basin, but also secondary oil/gas reservoirs formed through late reaccumulation of hydrocarbons from multiplestage cracking of crude oil.