The Bright Prospect of Quantitative Grain Fluorescence Technique in Applications in Hydrocarbon Accumulation and a New Case Study of Tight Oil and Gas

Abstract

Quantitative grain fluorescence technique (QGF) and quantitative grain fluorescence extraction technique (QGF-E) have been nowadays widely used in the study of conventional and unconventional hydrocarbon accumulation mechanism and characteristics. Compared with other organic geochemical methods, QGF and QGF-E show great advantages in high efficiency, strong sensitivity, little cost and simple operations. Around the world, the techniques have been successfully used in identifying palaeo-oil zones and residual-oil zones, restoring hydrocarbon charge history, determining the characteristics of palaeo-oil zones distribution (e.g. Tarim Basin, China), distinguishing the migration pathway of subtle oil reservoir in lithological pools (e.g. Bohai Bay Basin, China), defining the regular pattern of hydrocarbon migration and distribution (e.g. Junggar Basin, China) and discovering tight sandstone oil reservoirs with relatively low permeability (e.g. Ordos Basin, China and Eromanga Basin, Australia). In this paper, the QGF and QGF-E have been primarily applied in the study of Dehui fault depression and Gudian fault depression in Songliao Basin in China and nearly 130 tight sandstone samples were analyzed. Result shows that there was oil-water contact as well as palaeo-oil reservoir presented, and the destruction of palaeo-oil accumulation was explicit for the first time, which is a new discovery of tight oil and gas accumulation mechanism in Dehui fault depression and Gudian fault depression. Keywords: QGF; QGF-E; Hydrocarbon accumulation mechanism and characteristics; Dehui fault depression and Gudian fault depression; Songliao Basin; Tight oil and gas

AAPG Datapages/Search and Discovery Article #90291 ©2017 AAPG Annual Convention and Exhibition, Houston, Texas, April 2-5, 2017