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首页> 外文会议>Thirtieth workshop on geothermal reservoir engineering >GEOLOGIC FRAMEWORK OF THE EAST FLANK,COSO GEOTHERMAL FIELD: IMPLICATIONS FOR EGS DEVELOPMENT
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GEOLOGIC FRAMEWORK OF THE EAST FLANK,COSO GEOTHERMAL FIELD: IMPLICATIONS FOR EGS DEVELOPMENT

机译：东侧的地质框架，COSO地热场：对EGS开发的启示

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摘要

The Coso Geothermal Field is a large, highrntemperature system located in eastern California onrnthe western edge of the Basin and Range province.rnThe East Flank of this field is currently under studyrnas a DOE-funded Enhanced Geothermal Systemsrn(EGS) project. This paper summarizes petrologicrnand geologic investigations on two East Flank wells,rn34A-9 and 34-9RD2 conducted as part of arncontinuing effort to better understand how the rocksrnwill behave during hydraulic and thermal stimulation.rnWell 34A-9 is the hottest well at depth in the EastrnFlank, reaching nearly 350℃.rnThe reservoir on the East Flank is dominated byrndiorite and granodiorite. Specifically, the diorites arernseveral different quartz diorites and diorite. Thickrnintervals of granite, a minor rock type throughoutrnmost of the field, were encountered in 34A-9 and 34-rn9RD2. The granite tends to be much less altered,rnveined, and fractured than the other rock types, andrnthus probably a poor stimulation target.rnLate stage vein minerals include calcite, quartz,rnchlorite, and hematite at shallow depths and rarernepidote, chlorite, quartz, adularia, and wairakite inrnthe deepest portions of East Flank wells. Therndistribution of mineral assemblages suggest wellrn34A-9 was drilled through the caprock and into thernuppermost part of the reservoir rocks of a relictrngeothermal system.rnThe temperatures indicated by the clay minerals arernmuch lower than would be predicted from the presentrnday downhole temperatures, but are in goodrnagreement with fluid inclusion temperatures. Thesernrelationships imply the system is currently beingrnreheated.rnLost circulation zones tend to correlate with zones ofrnrelatively substantial calcite veining. Fluid inclusionrnmeasurements indicate some of the calcite wasrndeposited by high salinity fluids not related to therncurrent geothermal system. Other inclusions containrnlow salinity fluids that could be related to the currentrngeothermal system. These fracture zones have been episodically reactivated and modified by dissolutionrnand reprecipitation of calcite.
机译：Coso地热田是一个大型的高温系统，位于加利福尼亚州东部，盆地和Range省的西部边缘。该田的东翼目前正处于DOE资助的增强型地热系统（EGS）项目的研究之中。本文总结了两个东部侧井rn34A-9和34-9RD2的岩石学和地质学调查，作为继续努力的一部分，以更好地了解岩石在水力和热力刺激下的行为。rn34A-9是该井深部最热的井东侧，达到近350℃。东侧的储层以闪闪石和花岗闪长岩为主。具体地说，闪长岩是几种不同的石英闪长岩和闪长岩。在34A-9和34-rn9RD2中遇到了花岗岩的厚间隔，这是整个油田中的次要岩石类型。与其他类型的岩石相比，花岗岩的变质，脉动和破裂倾向要小得多，因此可能是较差的增产目标。晚期脉状矿物质包括浅深度的方解石，石英，绿泥石和赤铁矿以及稀有稀土，绿泥石，绿泥石，石英、,石，而wairakite浸入了East Flank井的最深部分。矿物组合的分布表明，34A-9井是通过盖层钻进的，进入了地热系统的储层岩石的最上部。粘土矿物所指示的温度比目前的井下温度所预测的温度要低得多，但与流体包裹体温度。这些关系表明系统当前正在被重新加热。循环流失区域往往与方解石脉络线相对较大的区域相关。流体包裹体测量表明一些方解石被高盐度流体沉积，与当前的地热系统无关。其他夹杂物含有可能与当前地热系统有关的低盐度流体。这些断裂带已经通过方解石的溶解和再沉淀进行了活化和改造。

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  • 会议地点 Stanford CA(US)
  • 作者

    K.M. Kovac; J.N. Moore; S.J. Lutz;

  • 作者单位

    Energy and Geoscience Institutern423 Wakara WayrnSalt Lake City, UT, 84108, U.S.A.rne-mail: kkovac@egi.utah.edu;

    Energy and Geoscience Institutern423 Wakara WayrnSalt Lake City, UT, 84108, U.S.A.;

    Energy and Geoscience Institutern423 Wakara WayrnSalt Lake City, UT, 84108, U.S.A.;

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