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A New Approach to Exploring for Anomalously Pressured Gas Accumulations: The Key to Unlocking Huge, Unconventional Gas Resources

Ronald C.Surdam, Zun sheng-Jiao, Yuri Ganshin   

  1. Innovative Discovery Technologies,LLC in Laramie,WY 82072 USA
  • Received:2003-09-20 Revised:2003-09-20 Online:2003-09-20 Published:2003-09-20

Abstract: Anomalously pressured gas(APG)accumulations,commonly denoted “basin-center” gas systems(BCGS),represent a huge,largely undeveloped gas resource.For example,in the Wind River Basin,Wyoming,which is approximately 8 500 mi2 in area,the USGS estimates the in-place anomalously pressured gas resource is 900 Tcf. The cumulative production to date from the anomalously pressured portion of the stratigraphic section in the Wind River Basin is less than 1 Tcf.This type of gas in-place to production imbalance is typical of all anomalously pressured,“basin-centered” gas accumulations.The huge, underdeveloped gas resources occurring in BCGS need to be more effectively exploited.In the past, the exploitation of APG resources has been difficult and costly,but recent successes in the Greater Green River and Wind River basins,W Y ,and relatively older successes in the Alberta,Denver-Julesburg,and San Juan basins,demonstrate that more effective exploitation is achievable.Most importantly,when success is achieved in the exploitation of an anomalously pressured gas accumulation,the financial awards can be outstanding.I agree that to more fully exploit the APG resources in so-called basin-center configurations will require new and more innovative exploration strategies,technologies, and diagnostic techniques,all with the dedicated objective of substantially increasing the rate and magnitude of convetting these gas resources to energy reserves. The research group at Innovative Discovery Technologies(IDT)has developed a new and effective w ay to efficiently explore and exploit anomalously pressured gas accumulations. Application of the IDT technology provides the operator,prior to drilling,with the following essential information:(1)the spatial distribution of gas-charged rock/fluid systems,including pressure compartment boundaries;(2)the location and nature of the regional pressure surface boundary,or boundary between normally and anomalously pressured fluid (either under-or overpressured);(3)the determination of gas and water content in the fluid;(4)the identification and spatial distribution of microfracture swarms;(5)the orientation and timing of faults;and(6)the nature of reservoir attributes. With the specialized information yielded by the IDT approach optimum drilling and completion practices can be designed and employed that will enable operators to avoid the many disastrous pitfalls currently associated with exploitation of gas.charged,anomalously pressured formations.