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Paper No. 12
Presentation Time: 11:00 AM

SOME INSIGHTS ON HYDROCARBON-BEARING FLUID INCLUSIONS IN CARBONATE RESERVOIRS: EVIDENCE FROM SYNTHETIC FLUID INCLUSIONS


CHEN, Yong, Department of Geology, School of Geosciences, China University of petroleum, No.66 West Changjiang Road, Economic and Technological Development Zone, Qingdao, Shandong, 266580, China, GE, Yunjin, Research Institute of Yanchang Petroleum (GROUP)Co. Ltd, Xi'an, 710075, China, FANG, Shihu, PetroChina Exploration and Development Institute, Beijing, 100083, China, ZHOU, Yaoqi, Department of Geology, School of Geosciences, China University of petroleum, No.66 West Changjiang Road, Economic and Technological Development Zone, Qingdao, 266580, China and ZHOU, Zhenzhu, College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China, yongchenzy@upc.edu.cn

In order to understand if fluid inclusions record the progress of oil and gas migration and accumulation, we synthesized hydrocarbon-bearing fluid inclusions in calcite at temperature and pressure similar to the conditions of natural reservoirs in Bohai Bay basin, eastern China. Fluid inclusions were synthesized at different experimental conditions by changing some parameters, including ratio of oil to water, type of oil, aqueous phase salinity, temperature and pressure during experiments. Experimental times were from 15 to 30 days.

All the synthetic hydrocarbon-bearing fluid inclusions were checked and analyzed by microscopy, micro-fluorescence and Fourier transform infrared spectroscopy. The results show that synthesized hydrocarbon-bearing fluid inclusions are very similar to natural ones in carbonate reservoirs. Experimental results give us some important insights as follows.

(1) Usually, homogenization temperatures of hydrocarbon-bearing fluid inclusions are lower than those of aqueous inclusions. Immiscibility of oil and water is the main reason for hydrocarbon-bearing inclusions and aqueous inclusions being distributed in different cracks.

(2) Rapid accumulation of oil and gas can be recorded by fluid inclusions as hydrocarbon-bearing inclusion can be formed in 15 days at temperatures and pressures similar to natural reservoirs.

(3) The growth of calcite was affected by oil, but was not terminated at any volume ratio of oil to water. That means the fluid inclusions can record whole history of oil accumulation. The proportion of hydrocarbon-bearing inclusions increases with volume ratio of oil to water, but decreases after the volume ratio of oil to water reaches 7:3.

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 40902040, 41172111), the Excellent Young Scientist Foundation of Shandong Province, China (No. BS2012NJ014), the Basic Research Foundation of Central University (No. 10CX05004A), and by a Project of PetroChina Exploration and Development Institute, China (No. 2011Y-003).

Session No. 1

New Insights in Geochemistry
Sunday, 27 October 2013: 8:00 AM-12:00 PM
Room 504 (Colorado Convention Center)
Geological Society of America Abstracts with Programs. Vol. 45, No. 7, p.29
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