煤田地质与勘探
煤田地質與勘探
매전지질여감탐
COAL GEOLOGY & EXPLORATION
2015年
2期
28-32
,共5页
煤层气%鄂尔多斯盆地东缘%有利区块优选%模糊数学综合评判%层次分析法
煤層氣%鄂爾多斯盆地東緣%有利區塊優選%模糊數學綜閤評判%層次分析法
매층기%악이다사분지동연%유리구괴우선%모호수학종합평판%층차분석법
coalbed methane%eastern Ordos basin%selection of favorable blocks%fuzzy mathematics comprehensive evaluation%hierarchy analytic process
鄂尔多斯盆地东缘经过20 a的勘探开发，煤层气仍然没有实现产业化。随着勘探资料的不断丰富，有必要对该区进行煤层气有利区块的优选和重新认识。在前人研究基础上，首先将鄂尔多斯盆地东缘埋深1500 m区域分为6个区块，选取煤层厚度、含气量、构造条件、水文条件、煤体结构、含气饱和度、储层压力梯度、渗透率和临界解吸压力与储层压力比9个参数作为区块优选指标，结合国内外及研究区实际情况制定了相应的评价临界值。将上述参数作为评价指标集合，以评价单元作为对象集，以有利、较有利和不利作为评级等级集合，然后运用模糊数学综合评判方法得到各评价单元的不同评价参数对评价等级的隶属度，并运用层次分析法确定了各指标的相对权重，最后得到了评价单元对评价等级的隶属度。根据最大隶属度原则，吴堡–柳林属于有利区，大宁–吉县和韩城属于较有利区，准格尔、府谷、河曲–临县属于不利区，吴堡–柳林的煤层气可采性好于大宁–吉县和韩城。因此，建议将吴堡–柳林、大宁–吉县和韩城定为研究区煤层气优先开发区块。
鄂爾多斯盆地東緣經過20 a的勘探開髮，煤層氣仍然沒有實現產業化。隨著勘探資料的不斷豐富，有必要對該區進行煤層氣有利區塊的優選和重新認識。在前人研究基礎上，首先將鄂爾多斯盆地東緣埋深1500 m區域分為6箇區塊，選取煤層厚度、含氣量、構造條件、水文條件、煤體結構、含氣飽和度、儲層壓力梯度、滲透率和臨界解吸壓力與儲層壓力比9箇參數作為區塊優選指標，結閤國內外及研究區實際情況製定瞭相應的評價臨界值。將上述參數作為評價指標集閤，以評價單元作為對象集，以有利、較有利和不利作為評級等級集閤，然後運用模糊數學綜閤評判方法得到各評價單元的不同評價參數對評價等級的隸屬度，併運用層次分析法確定瞭各指標的相對權重，最後得到瞭評價單元對評價等級的隸屬度。根據最大隸屬度原則，吳堡–柳林屬于有利區，大寧–吉縣和韓城屬于較有利區，準格爾、府穀、河麯–臨縣屬于不利區，吳堡–柳林的煤層氣可採性好于大寧–吉縣和韓城。因此，建議將吳堡–柳林、大寧–吉縣和韓城定為研究區煤層氣優先開髮區塊。
악이다사분지동연경과20 a적감탐개발，매층기잉연몰유실현산업화。수착감탐자료적불단봉부，유필요대해구진행매층기유리구괴적우선화중신인식。재전인연구기출상，수선장악이다사분지동연매심1500 m구역분위6개구괴，선취매층후도、함기량、구조조건、수문조건、매체결구、함기포화도、저층압력제도、삼투솔화림계해흡압력여저층압력비9개삼수작위구괴우선지표，결합국내외급연구구실제정황제정료상응적평개림계치。장상술삼수작위평개지표집합，이평개단원작위대상집，이유리、교유리화불리작위평급등급집합，연후운용모호수학종합평판방법득도각평개단원적불동평개삼수대평개등급적대속도，병운용층차분석법학정료각지표적상대권중，최후득도료평개단원대평개등급적대속도。근거최대대속도원칙，오보–류림속우유리구，대저–길현화한성속우교유리구，준격이、부곡、하곡–림현속우불리구，오보–류림적매층기가채성호우대저–길현화한성。인차，건의장오보–류림、대저–길현화한성정위연구구매층기우선개발구괴。
After 20 year exploration and development, the CBM industrialization hasn’t been realized in eastern Ordos basin. With the enrichment of CBM exploration data, it is necessary to select favorable blocks. In this paper, firstly, in combination with previous research, the area shallower than 1500m in eastern Ordos basin may be divided into six blocks, and 9 parameters were chosen as selecting index, such as coal seam thickness, gas content, tectonic condition, hydrologic condition, coal structure, gas saturation, reservoir pressure gradient, permeability and the ratio of critical reservoir pres-sure to the reservoir pressure; secondly, the corresponding critical evaluation value was determined. The above 9 pa-rameters are set as the evaluation index aggregate, evaluation unit as the object aggregate, favorable, sub-favorable and unfavorable as rating level aggregate. Then by using the fuzzy mathematics comprehensive evaluation method, the membership degree to the evaluation grades of the evaluation parameters for each evaluation unit was obtained, and by using hierarchy analytic process, the relative weight of every index was obtained. Finally, the membership degrees to the evaluation rating was obtained. According to the maximum membership degree principle, Wubao-Liulin was sorted as favorable area, Daning-Jixian and Hancheng as sub-favorable areas, and Zhungeer, Fugu, Hequ-LinXian as unfavorable areas, the CBM recovery in Wubao-Liulin is higher than that in Daning-Jixian and Hancheng, and Wubao-Liulin, Dan-ing-Jixian and Hancheng were proposed as CBM priority development blocks in eastern Ordos basin.
