首页|Distribution and Geochemical Characteristics of Fluids in Ordovician Marine Carbonate Reservoirs of the Tahe Oilfield

Distribution and Geochemical Characteristics of Fluids in Ordovician Marine Carbonate Reservoirs of the Tahe Oilfield

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The Ordovician carbonate reservoirs in the Tahe Oilfield are highly heterogeneous, which have undergone multiple superimposed transformations by tectonic activities and karst processes, leading to an extremely complex fluid distribution. The geochemical characteristics of geofluids also display great disparities. Results show that the vertical distribution of oil and gas are continuous, how-ever the oil-water interfaces in different blocks of the Tahe Ordovician Oilfield are numerous. Meteoric water infiltration is regarded as the main reason for the high oil-water interface and high water content to the north of Tahe Oilfield, especially in well blocks S78-S73. The isotopic values of deuterium-oxygen in the groundwater and carbon-oxygen from calcite veins confirm that formation water in Ordovician reservoirs of the Tahe Oilfield was a mix of meteoric water and connate water, and the proportion of meteoric water gradually increases from south to north, while connate water decreases. The Tahe Or-dovician reservoirs are characterised by multiple hydrocarbon charges, and the general migrating di-rection is from southeast to northwest and from east to west. High production could be obtained in the northern area of the Tahe Oilfield since the oil layers are thick and oil is highly saturated. The residual water within the reservoirs is low, and heavy oil is dominant in this area. Only a small amount of pore water has been replaced by oil in the southern Tahe Oilfield, leading to low oil saturation and a high content of residual water. Crude oil is herein mainly of medium-light type. During the process of explo-ration in this region, acid fracturing reformation is usually required for wells to increase their output;however the yield is still low.

fluid distributiongeochemical characteristicsresidual waterTahe Oilfield

Mei Li、Zhanghua Lou、Rong Zhu、Aimin Jin、Ying Ye

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cean College, Zhejiang University, Hangzhou 310058, China

Open Fund of the State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationNational Natural Science Foundation of ChinaNational Science& Technology Major ProjectNational Science& Technology Major Project

PLC201002408399022011ZX05005-003-008HZ2011ZX05002-006-003HZ

2014

10.1007/s12583-014-0453-3

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSCDSCI
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2014.(3)
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