Paleo-Oil Leg Recognition and Its Application to Petroleum Exploration

Abstract

Abstract: The technologies 10 detect paleo-oil leg include three parts: 1) recognition of zones with high porosity and high permeability, 2) analysis of residual hydrocarbons, and 3) history match for basinal fuids. The grain index and quantitalive nuorescence gain rely on the micro-petrography and laser scanning analysis to detemine the abundance of oil inclusion in reservoir, which characterizes paleo-oil saturation. The grain index of oil zone is generally over 5%, but higher than 10% for some samples at least. The grain index of aquifer is normally lower than 1%. Some samples from oil zone are lack of high value of grain index (higher than 5%), which indicates rapid petroleum accumulation or shallower accumulation. In pathways of petroleum migration, the grain index mainly ranges from 1% to 5%, but they are locally distributed vertically. It is coneluded that the grain index of oil inclusion and quantitative grain fluorescence technologies can be applied to recognize paleooil leg, delineate palevoil and water c'ontact, lrace re-migrated petroleum, confirm oil charge event before gas or condensate gas accumulation, find out secondary reservoir and underlying reservoir, and allow the charge history to be accurately constrained.

Key words: paleo petroleum leg, migration palhway, fossil record, fluid inclusion, hydrocarbon fluid

CLC Number:

TE112.5

WANG Fi-yu, PANG Xiong-qi, ZENG Hua-sen, SHI Yu-lei, HU Jian-feng, LIU Ke-yu. Paleo-Oil Leg Recognition and Its Application to Petroleum Exploration[J]. Xinjiang Petroleum Geology, 2005, 26(5): 565-569.

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