Distribution Characteristics Of Geotemperature Field In Jiyang Depression, Shandong, North China

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Journal Article: Distribution Characteristics Of Geotemperature Field In Jiyang Depression, Shandong, North China

Abstract
Based on the analysis of geotemperature data derived from 703 exploration wells in the Jiyang depression of the Shengli oilfield, Shandong, North China, in combination with corresponding geothermal calculations, we present the geothermal field distribution characteristics of this region, which include the plane contour plots of geothermal gradient present day, geotemperature at depths 3km, 4km and 5km, respectively, as well as the top surface of lower Tertiary Es-4 formation of Jiyang depression. The results show that the average geothermal gradient present day of the whole Jiyang depression is about 35.5degreesC/km, the corresponding gradients of its four main sags, i. e. Zhanhua, Dongying, Chezhen and Huimin, are 36.1degreesC /km, 35.5degreesC /km, 35.4degreesC/km, and 34.6degreesC/km, respectively. While in the Weihei sag, outer flank of the Jiyang depression, it is 35.5degreesC/km. The distribution of geothermal gradient and geotemperature in the Jiyang depression is mainly governed by its tectonic framework of alternating uplifts and depressions areas. This distribution is also correlated with the basement depth. It is characteristiced by higher temperature in uplifts and lower one in depressions. In addition, those regions of relatively high geothermal gradient are consistent with those of Cenozoic volcanic rocks distribution. The pattern of basement depth of the Jiyang depression, which is also the distribution of uplifts and depressions, is controlled by the lithospheric extension during basin formation. This geodynamic process also accounts for the distribution of volcanic rocks in this region, consequently, the geothermal field characteristics of the Jiyang depression is governed by its tectonic evolution process. In addition, our results also indicate that most of the Es-4 formation in the Jiyang depression is still within liquid window of oil and gas.

Authors 
Y. L. Gong, L. S. Wang, S. W. Liu, L. Z. Guo and J. G. Cai








Published Journal 
Chinese Journal of Geophysics-Chinese Edition, 2003





DOI 
Not Provided
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Citation

Y. L. Gong,L. S. Wang,S. W. Liu,L. Z. Guo,J. G. Cai. 2003. Distribution Characteristics Of Geotemperature Field In Jiyang Depression, Shandong, North China. Chinese Journal of Geophysics-Chinese Edition. (!) .