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CHARACTERISTICS AND GENESIS OF ORDOVICIAN RESERVOIR BITUMEN IN SHUNNAN AREA, TARIM BASINGold Open Access

Authors: Y. Yang, H. Liu, S. Wang, Z. Jiang and Y. Wang
Event name: 29th International Meeting on Organic Geochemistry
Session: Posters - Unconventionals
Publication date: 04 September 2019
DOI: 10.3997/2214-4609.201903029
Language: English
Info: Extended abstract, PDF ( 466.79Kb )

Summary:
A large amount of reservoir bitumen has been discovered in Shunnan area of Tarim Basin. The analyses of its characteristics and genesis are helpful to reveal the adjustment and transformation process of oil and gas reservoirs. Through the comprehensive application of polarizing microscope, fluorescence microscope and laser Raman microspectroscopy, the occurrence classification, composition characteristics and thermal evolution features of Ordovician reservoir bitumen in Shunnan area can be studied. And the origin of reservoir bitumen is discussed in combination with previous studies. The results show that:(ⅰ) The bitumen of Middle-Lower Ordovician reservoirs is widely distributed in the stylolite; (ⅱ) In the limestone reservoir of Yijianfang Formation and Yingshan Formation, the dissolution pores and microfractures are also the common reservoir spaces of reservoir bitumen; (ⅲ) In the dolomite reservoir of Penglaiba Formation, the reservoir bitumen is mainly distributed in the stylolite of inherited development, the microcracks and the dolomite crystal. Under ultraviolet fluorescence, the reservoir bitumen of different layers and occurrence in Shunnan area is black (no fluorescence emission).The corresponding laser Raman results also show that the reservoir bitumen in Shunnan area is over matured (Ro%calc is 2.0~ 2.3%) and formed in the same geological period.

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