Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (5): 682-688.doi: 10.11743/ogg20060514

Previous Articles     Next Articles

Characteristics of surface hydrocarbon anomalies in Shiwu faulted depression in southern Songliao basin and their significance as an oil/gas indicator

Xia Xianghua1,2, Hu Kai1, Qin Jianzhong2   

  1. 1. Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. Wuxi Research Unit of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu 214151
  • Received:2006-08-17 Online:2006-10-25 Published:2012-01-16

Abstract:

For more than 70 years,surface geochemical exploration technology has been applied in the prediction of deep oil and gas reservoirs through observing anomalous surface expression of hydrocarbon microseepage.It is generally accepted that hydrocarbon may leak from reservoirs through microseepage,but the complex relationship between surface geochemical anomaly and deep hydrocarbon accumulation has not yet been proven.Hydrocarbon microseepage detection in the known oil and gas accumulation in Shiwu faulted depression shows that all of the geochemical indicators in this area are characterized’by heterogeneous geochemical field with low background value,and the concentration of hydrocarbons in the anomalous area is relatively high.The anomalies related to oil and gas accumulation are annular or complex annular while the anomalies caused by a fault or cap rock are banded or block-shaped.The microseepage anomaly in a gas field has different features with that in an oil and gas field.The former is low in intensity and simply annular in shape,while the latter is complicated annular in shape,with some anomalous indicators occurring within the ring.

Key words: hydrocarbon, microseepage, anomaly shape, anomaly characteristics, Shiwu faulted depression, southern songliao basin

CLC Number: