{"id":18937,"date":"2022-06-08T08:00:46","date_gmt":"2022-06-08T00:00:46","guid":{"rendered":"http:\/\/learncmg.cn\/?p=18937"},"modified":"2022-06-08T08:00:46","modified_gmt":"2022-06-08T00:00:46","slug":"133-recent-water-disposal-and-pore-pressure-evolution-in-the-delaware-mountain-group-delaware-basin-southeast-new-mexico-and-west-texas-usa","status":"publish","type":"post","link":"http:\/\/learncmg.cn\/?p=18937","title":{"rendered":"133. \u65b0\u58a8\u897f\u54e5\u5dde\u4e1c\u5357\u90e8\u548c\u5fb7\u514b\u8428\u65af\u5dde\u897f\u90e8\u76c6\u5730\u6c34\u5904\u7406\u548c\u5b54\u9699\u538b\u529b\u6f14\u53d8\u6a21\u62df"},"content":{"rendered":"
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Recent water disposal and pore pressure evolution in the Delaware Mountain Group, Delaware Basin, Southeast New Mexico and West Texas, USA<\/a><\/h3>\n

ABSTRACT<\/strong><\/p>\n

Study region: A flat, large, semi-arid plateau in the southwest United States (west Texas and southeast New Mexico) underlain by a deep Paleozoic sedimentary basin, the tectonic Delaware Basin, host of intensive hydrocarbon production. Study focus: Impacts of injection of large volumes of water produced from oil and gas wells and injected through 1000 + disposal wells, in particular, pressure buildup, induced seismicity and their potential consequences, in a formation underlying fresh-water aquifers but separated from them by thick layers of evaporites. The target formation is the Delaware Mountain Group (DMG) of Permian age and consisting of up to 4500 ft (~1400 m) of mostly fine-grained, deepwater siliciclastic slope and basin deposits (sandstones, siltstones, and minor limestones). A flow model was developed and calibrated from well log data, stratigraphic data, petrophysical analyses, and core data (123 \u00d7170 mi2 - 1 \u00d71 mi2 grid size) complemented with dynamic injectivity infor\u0002mation based on surface injection pressures and rates of the disposal wells. New hydrological insights for the region: Injection of 5.8 billion barrels (0.92 billion m3) of waste water has generated regional pressure increases in the DMG mostly in the 100\u2013400 psi (0.7\u20132.8 MPa) range: (1) creating strong artesian conditions that, combined with the presence of numerous historical boreholes, could connect DMG and fresh-water aquifers; and (2) generating conditions leading to actually observed moderate induced seismicity.<\/p>\n

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