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首页> 外文期刊>Energy & fuels >Cleat Orientation from Ground Mapping and Image Log Studies for In Situ Stress Analysis: Coal Bed Methane Exploration in South Karanpura Coalfield, India
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Cleat Orientation from Ground Mapping and Image Log Studies for In Situ Stress Analysis: Coal Bed Methane Exploration in South Karanpura Coalfield, India

机译：地面测绘和图像测井研究的地层定向用于原地应力分析：印度南卡兰普拉亚煤田的煤层气勘探

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摘要

Conventional well logs from three wells in South Karanpura coalfield are analyzed to correlate 10 major coal seams belonging to the Barakar formation for coalbed methane (CBM) exploration. Face cleat orientations are studied for the Simana and Argada coal seams from the Sirka and Argada mines. It varies from 130 to 140 degrees N for a total 349 face cleats observed from Simana and Argada coal seams. Cleat identification and its orientation have also been analyzed from simultaneous acoustic and resistivity (STAR) log from two CBM wells located 20-22 km away from the Sirka and Argada mines. Total number of fractures is found to be 1118 from two wells. Face cleats are not distinguishable from STAR image. Fracture density in coal is varying from 2.48 fractures per meter to 23.8 fractures per meter with a maximum density in the Banasgarah seam. Fracture orientations observed in Saunda, Sayal, Balkudra, Kurse, Hathidari, Banasgarah, and Argada vary from 10 degrees N to 115 degrees N. The in situ maximum horizontal stress (S-H) is computed from azimuthal anisotropy data, using a cross-multipole array acoustic (XMAC) log from a well. Azimuthal anisotropy ranges between 3.5% and 7.6%. The S-H orientation varies from 110 degrees N to 115 degrees N. It is observed from the XMAC azimuthal anisotropy analysis that the orientation of S-H in the Argada seams varies from 110 degrees N to 113 degrees N. The 163 face cleats in Argada seams at Argada are oriented toward 135 degrees N-140 degrees N. This indicates that the face cleats are aligned parallel to subparallel with the S-H direction. Good fracture density, open fractures/face cleats toward S-H are to be useful for CBM extraction from these wells.
机译：分析了南部Karanpura煤田的三口井的常规测井资料，以关联属于Barakar组的10个主要煤层进行煤层气（CBM）勘探。研究了Sirka和Argada煤矿的Simana和Argada煤层的煤层走向。在Simana和Argada煤层中观察到的总共349个面夹角，其变化范围为130至140度N。还从距离Sirka和Argada矿山20-22 km的两个煤层气井的同时测得的声波和电阻率（STAR）测井资料分析了割理的识别及其方向。从两口井中发现的裂缝总数为1118。面部防滑钉无法与STAR图像区分开。煤中的裂缝密度从每米2.48裂缝到每米23.8裂缝不等，Banasgarah煤层中的裂缝密度最大。在Saunda，Sayal，Balkudra，Kurse，Hathidari，Banasgarah和Argada中观察到的断裂方向从10°N到115°N不等。使用交叉多极阵列根据方位各向异性数据计算原位最大水平应力（SH）。井中的声波（XMAC）测井。方位各向异性在3.5％到7.6％之间。 SH方向在110度N到115度N之间变化。从XMAC方位各向异性分析可以看出，Argada接缝中SH的方向从110°N到113度N之间变化。Argada Argada接缝中的163个面夹板方向朝向135度N-140度N。这表示面夹板平行于SH方向平行于次平行。良好的压裂密度，朝向S-H的裸眼裂缝/正面割理可用于从这些井中开采煤层气。

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  • 来源
    《Energy & fuels》 |2017年第7期|6812-6824|共13页
  • 作者

    Ali Muhammed; Paul Suman; Chatteriee Rima;

  • 作者单位

    Oil & Nat Gas Corp Ltd, Ahmadabad, Gujarat, India;

    Al Habeeb Coll Engn & Technol, Dept Petr Engn, Hyderabad, Andhra Pradesh, India;

    Indian Sch Mines, Indian Inst Technol, Dept Appl Geophys, Dhanbad, Bihar, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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