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Investigation and application of a discrimination method for abnormal high formation pressure forming mechanism
YE Zhi1,FAN Hong-hai1,CAI Jun2,JI Rong-yi1,LI Chao-wei1,LIU Gang1
(1. MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing 102249, China ;2. CNOOC Zhanjiang Branch,Zhanjiang 524057, China)
Abstract:
The forming mechanisms of abnormally high formation pore pressure were systematically summarized and the mechanical relation in the sedimentary compaction process was analyzed. The mechanisms of abnormally high formation pore pressure were categorized. A method to discriminate the forming mechanisms of abnormally high pressure was proposed according to the different logging response of the formation's loading and unloading procedure and the geological characteristics of typical structure in tectonic compression environments. The logging data of one well with high temperature and high pressure in Yingqiong Basin at South China Sea were collected. The results show that the mechanisms of under-compaction, tectonic compression and fluid expansion can be determined by this method. A reasonable model to calculate the pore pressure of this well can be selected. There is abnormal high pressure over 3.45 km deep zone,which is caused by fluid expansion mechanism. The precision of pore pressure calculation is significantly improved by using the selected pressure calculation mode.
Key words:  abnormal high pressure  forming mechanisms  discrimination method  application