塔中26-24井区良里塔格组储层烃包裹体特征及成藏期次

doi:10.11743/ogg20110503

Abstract

Abstract:

Carbonate reservoirs of the Ordovician Lianglitage Formation in Tazhong26-24 wellblock are abundant in hydrocarbon inclusions.Three stages of hydrocarbon inclusions,including Ⅰ,Ⅱ and Ⅲ,are identified in the study area through analyses of occurrence,growth relationship and characteristics of the hydrocarbon inclusions,as well as microthermometric analysis of hydrocarbon inclusions and their coexisting aqueous inclusions.The stage Ⅰ inclusions(Ⅰ:OL+OLG) are dominated by light brown and colorless liquid hydrocarbon inclusions which exhibit moderate yellow to yellowish-white fluorescence under the UV-light.The stage Ⅱ inclusions(Ⅱ:OLG+OG) are mainly colorless and extremely light brown oil & gas inclusions with strong blue white to blue fluorescence under the UV-light.The stage Ⅲ inclusions(Ⅲ:OLG+OG+OA)are mainly light brown,brown and deep brown oil & gas hydrocarbon inclusions which are characterized by strong yellow to tan-colored fluorescence under the UV-light.Moreover,they were formed within temperature ranges of 80~90℃,90~100℃ and 97~110℃ respectively.Finally,in combination with the geological background of the study area,we believe that there are three accumulation periods in the Lianglitage Formation of Tazhong26-24 wellblock:intermedium hydrocarbon accumulation in the Late Hercynian period,light oil-condensates accumulation in the Early Himalayan period and highly mature hydrocarbon accumulation in the Late Himalayan period.

Key words: hydrocarbon inclusion, aqueous inclusion, hydrocarbon accumulation timing, Lianglitage Formation, Tazhong area

CLC Number:

TE121.1

Xing Yongliang, Zhang Nai, Zhang Baoshou, Zhao Ruihua, Chen Yangui, Yang Xiaoguang. Characteristics of hydrocarbon inclusions and the timing of the hydrocarbon accumulation in the Lianglitage Fm in Tazhong26-24 wellblock[J]. Oil & Gas Geology, 2011, 32(5): 651-658.

References

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Characteristics of hydrocarbon inclusions and the timing of the hydrocarbon accumulation in the Lianglitage Fm in Tazhong26-24 wellblock

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