中国岩溶
中國巖溶
중국암용
CARSOLOGICA SINICA
2013年
4期
384-390
,共7页
模糊数学%地热资源%岩溶储层%勘探风险评价
模糊數學%地熱資源%巖溶儲層%勘探風險評價
모호수학%지열자원%암용저층%감탐풍험평개
fuzzy math%geothermal resources%karst reservoir%evaluation on exploration risk
重庆市岩溶储层地热资源丰富,开发利用历史悠久,但地热资源勘探风险较大。本文利用模糊综合评价法建立了风险评价模型,该模型中包含了热储构造开启程度、热储构造部位、沟谷切割程度、物探效果、热储埋深、热储厚度、热储岩层倾角、热异常情况、热储层位9个风险因子,每个因子划分为风险小、风险中等、风险大3级,并对其进行量化处理。最后对全市23个高隆起背斜两翼46个相对独立的山地型高隆起岩溶地热田共79个地热单元进行了地热资源勘探风险模糊数学综合评判。结果表明,有18个单元为风险小,42个单元为风险中等,19个单元为风险大。风险小的地热田一般热储汇水面积较大、补给径流循环条件好、热储顶板埋深1000~1800 m、热储厚度≥300 m、热储岩层倾角25~40°、深部裂隙较发育；风险大的地热田热储汇水面积较小、补给径流循环条件差、热储顶板埋深≥2500 m、热储厚度<200 m、热储岩倾角<20°或≥40°、深部裂隙不发育；风险中等地热田的地质特征则介于二者之间。评价结果较好地反映出了重庆市岩溶热储地热资源勘探风险状况。
重慶市巖溶儲層地熱資源豐富,開髮利用歷史悠久,但地熱資源勘探風險較大。本文利用模糊綜閤評價法建立瞭風險評價模型,該模型中包含瞭熱儲構造開啟程度、熱儲構造部位、溝穀切割程度、物探效果、熱儲埋深、熱儲厚度、熱儲巖層傾角、熱異常情況、熱儲層位9箇風險因子,每箇因子劃分為風險小、風險中等、風險大3級,併對其進行量化處理。最後對全市23箇高隆起揹斜兩翼46箇相對獨立的山地型高隆起巖溶地熱田共79箇地熱單元進行瞭地熱資源勘探風險模糊數學綜閤評判。結果錶明,有18箇單元為風險小,42箇單元為風險中等,19箇單元為風險大。風險小的地熱田一般熱儲彙水麵積較大、補給徑流循環條件好、熱儲頂闆埋深1000~1800 m、熱儲厚度≥300 m、熱儲巖層傾角25~40°、深部裂隙較髮育；風險大的地熱田熱儲彙水麵積較小、補給徑流循環條件差、熱儲頂闆埋深≥2500 m、熱儲厚度<200 m、熱儲巖傾角<20°或≥40°、深部裂隙不髮育；風險中等地熱田的地質特徵則介于二者之間。評價結果較好地反映齣瞭重慶市巖溶熱儲地熱資源勘探風險狀況。
중경시암용저층지열자원봉부,개발이용역사유구,단지열자원감탐풍험교대。본문이용모호종합평개법건립료풍험평개모형,해모형중포함료열저구조개계정도、열저구조부위、구곡절할정도、물탐효과、열저매심、열저후도、열저암층경각、열이상정황、열저층위9개풍험인자,매개인자화분위풍험소、풍험중등、풍험대3급,병대기진행양화처리。최후대전시23개고륭기배사량익46개상대독립적산지형고륭기암용지열전공79개지열단원진행료지열자원감탐풍험모호수학종합평판。결과표명,유18개단원위풍험소,42개단원위풍험중등,19개단원위풍험대。풍험소적지열전일반열저회수면적교대、보급경류순배조건호、열저정판매심1000~1800 m、열저후도≥300 m、열저암층경각25~40°、심부렬극교발육；풍험대적지열전열저회수면적교소、보급경류순배조건차、열저정판매심≥2500 m、열저후도<200 m、열저암경각<20°혹≥40°、심부렬극불발육；풍험중등지열전적지질특정칙개우이자지간。평개결과교호지반영출료중경시암용열저지열자원감탐풍험상황。
Geothermal resources of karst reservoir are rich in Chongqing,belonging to the mountain type. The karst thermal reservoir,stripped in shape and distributing independently in the thermal field,is located in both wings beside 23 high uplift anticlines and 1-2 km from the axis of the anticlines in the city.The geo-thermal resources exploration has a long history,but there are risks.In this study,in order to quantitatively or semi-quantitatively evaluate the risk of the exploration a risk assessment model is established with the fuzzy comprehensive evaluation method.The model contains 9 risk factors:the opening degree of thermal reservoir structure,thermal storage structure,alley cutting degree,geophysical prospecting effect,buried depth,thickness of geothermal reservoir,thermal reservoir strata dip angle,thermal anomalies and thermal reservoir layer.Each risk factor can be divided into three levels,including small,medium and big risk level. Quantitative processing is carried out for this model.Comprehensive evaluation of geothermal resource ex-ploration risk with fuzzy mathematics on 23 high uplift anticlines,46 high mountain uplift karst geothermal fields (a relatively independent geothermal field on each legs)and 79 geothermal units in this city was per-formed.The evaluation results indicate that there are 18 units in small risk,42 units in medium risk and 1 9 units in high risk.The geothermal field with small risk generally has large heat reservoir catchment’s area and good recharge runoff circulation conditions,with roof heat reservoir being buried 1 000-1 800 m deep, thermal reservoir thickness bigger than 300 m,thermal reservoir strata dip angle being 25 -40°,and deep fissure developed,such as the evaluation unit of Xishan anticline at the northern section of the west wing. The geothermal field with high risk has smaller catchment’s area and poor recharge runoff circulation condi-tions,with roof heat reservoir being buried more than 2 500 m deep,thermal reservoir thickness smaller than 200 m,thermal reservoir strata dip angle <20°or ≥40°,and deep fissure undeveloped,such as the e-valuation unit at the southern section of the Xindianzi anticline.The geological characteristic of geothermal field with medium risk is between the two.The evaluation results have nicely reflected the risk state in ex-ploration for the geothermal resources in the karst heat reservoir in Chongqing.
