SPOROPOLLEN ASSEMBLAGE OF SANJIANFANG FORMATION IN MIDDLE JURASSIC IN TAIBEI SAG, TURPAN-HAMI BASIN

Abstract

Abstract: Tabei sag is the main hydrocarbon-bearing area in Turpan-Hami basin, while the thick stratified sandstone of Sanjianfang formation is the main reservoi r in this area.Based on the analysis of samples from Wells Pu 1 and Caonan 1, sporopollens fossils discovered in Sanjianfang formation consist of 33 genera 69 species, the sporopollen assemblage can be established as Cyathidi tes-Classopollis-Picei tes according to the percentage of genera and species and their geologic significances.It is dominated by gymnospermous pollen, accounting for 60 %, next is the pteridophyta spore, accounting for 39.6%.By analysing the geologic history of main classes and important genera and species, along with the contact relationships of the Sanjianfang formation wi th overlying and underlying strata, i t is considered that the sporopollen assemblage from Sanjianfang formation is similar to the one from Lanqi formation in western Liaoning province.Its geologic age is the middle stage of Middle Jurassic, corresponding to Bajocian-Bathonian stage in general.

Key words: Turpan basin, Hami basin, Middle Jurassic, Sporopollen assemblage, Gymnospermae, Pteridophyte

Ji Liming, Wang Fatai, Zhang Xiaobao, Wang Wuhe. SPOROPOLLEN ASSEMBLAGE OF SANJIANFANG FORMATION IN MIDDLE JURASSIC IN TAIBEI SAG, TURPAN-HAMI BASIN[J]. Xinjiang Petroleum Geology, 1998, 19(4): 290-298.

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