煤系地层地震储层预测技术研究和应用:以鄂尔多斯盆地临兴气田太2段为例
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摘要
临兴气田位于鄂尔多斯盆地东部,已钻井揭示太2段具有良好的勘探开发前景。受沉积相控制,太原组为一套煤系地层,由于煤层与围岩阻抗差异大,会产生低频、连续、强振幅的反射,屏蔽砂岩的有效信号,严重干扰储层预测,同时本区砂岩与泥岩纵波阻抗叠置,利用常规波阻抗反演方法和地震属性难以预测。针对上述难点,首先通过正演模拟方法确定煤层影响范围,然后利用子波分解重构技术去除煤层影响,最后通过构建目标曲线,采用分频反演技术,完成了储层预测,优选了有利钻探目标,L-103井在太2段钻遇15.2m厚的气层,试气获得15.1×104 m3/d的无阻工业气流,取得了新突破,证实煤系地层储层预测技术准确,具有一定的借鉴和推广价值,对开辟鄂尔多斯盆地东部地区天然气勘探新局面具有重要的指导意义。
Linxing Gasfield,located in the eastern Ordos Basin,has a bright prospect in reservoir exploration and development on Tai2 Segment.Taiyuan Formation is characterized by coal-bearing strata controlled by sedimentary facies.The seismic reflection of the coal shows low-frequency,continuous and highamplitude to shields effective signal of sandstone disturbing reservoir prediction because of the different impedances between the coal and surrounding rocks.Conventional impedance inversion method and seismic attributes are hard to forecast gas reservoir in this area because of superimposed p-wave impedance of sandstone and mudstone.This article determines the influence of coal seams through the seismic forward modeling,removes the influence of coal seams using wavelet decomposition reconstruction technology,and then,builds the target curve using frequency division inversion technique to complete the reservoir prediction and optimize the drilling targets.Well L-103 yields 15.2 meters of gas-bearing formation and reaches the absolute open flow of gas production test 15.1×104 m3/d.It is proved that the reservoir prediction technology of coal measure strata is applicable to this area and has certain reference and promotion value.It also has great significance to the natural gas exploration in eastern Ordos Basin.
Linxing Gasfield,located in the eastern Ordos Basin,has a bright prospect in reservoir exploration and development on Tai2 Segment.Taiyuan Formation is characterized by coal-bearing strata controlled by sedimentary facies.The seismic reflection of the coal shows low-frequency,continuous and highamplitude to shields effective signal of sandstone disturbing reservoir prediction because of the different impedances between the coal and surrounding rocks.Conventional impedance inversion method and seismic attributes are hard to forecast gas reservoir in this area because of superimposed p-wave impedance of sandstone and mudstone.This article determines the influence of coal seams through the seismic forward modeling,removes the influence of coal seams using wavelet decomposition reconstruction technology,and then,builds the target curve using frequency division inversion technique to complete the reservoir prediction and optimize the drilling targets.Well L-103 yields 15.2 meters of gas-bearing formation and reaches the absolute open flow of gas production test 15.1×104 m3/d.It is proved that the reservoir prediction technology of coal measure strata is applicable to this area and has certain reference and promotion value.It also has great significance to the natural gas exploration in eastern Ordos Basin.
引文
[1]兰朝利,张君峰,陶维祥,等.鄂尔多斯盆地神木气田太原组沉积特征与演化[J].地质学报,2011,85(4):533-542.
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[11]季玉新,刘春园,陈冬,等.分频反演方法及其在塔河A区储层预测中的应用[J].石油与天然气地质,2010,31(1):38-42.
[12]常炳章,王艳,辛利波.分频反演技术在泌阳凹陷井楼-高庄地区的应用[J].石油与天然气学报,2008,30(2):463-465.
[13]黄林军,潘建国,黄玉,等.分频反演技术在准东XIQ地区古沟谷薄砂层储层预测中的应用[J].石油与天然气学报,2012,34(11):52-55.
[14]于建国,韩文功,刘力辉.分频反演方法及应用[J].石油地球物理勘探,2006,41(2):193-197.
[15]陶倩倩,李达,杨希冰,等.利用分频反演技术预测烃源岩[J].石油地球物理勘探,2015,50(4):706-713.
[16]王振卿,王宏斌,张虎权,等.分频波阻抗反演技术在塔中西部台内滩储层预测中的应用[J].天然气地球科学,2014,25(11):1847-1854.
[17]高静怀,陈文超,李幼铭,等.广义S变换与薄互层地震响应[J].地球物理学报,2003,46(4):526-532.
[18]张廷章,尹寿鹏,张巧玲,等.地震分频技术的地质内涵及其效果分析[J].石油勘探与开发,2006,33(1):64-66.
[19]徐丽英,徐鸣洁,陈振岩.利用谱分解技术进行薄储层预测[J].石油地球物理勘探,2006,41(3):299-302.
[20]齐宇,刘震,魏建新,等.基于小波变换的谱分解技术在地震模型解释中的应用[J].新疆石油地质,2010,31(3):417-419.
[2]兰朝利,张永忠,张君峰,等.神木气田太原组储层特征及其控制因素[J].西安石油大学学报:自然科学版,2010,25(1):7-11.
[3]董宁,刘振峰,周小鹰,等.鄂尔多斯盆地致密碎屑储层地震识别及预测[J].石油与天然气地质,2008,29(5):668-675.
[4]王香文,于常青,董宁,等.储层综合预测技术在鄂尔多斯盆地定北区块的应用[J].石油物探,2006,45(3):267-271.
[5]王宝江,张永常,王大兴,等.广义S变换用于含煤地层薄砂体预测研究[J].地球物理学进展,2012,27(3):1219-1226.
[6]刘振峰.致密砂岩油气藏地震地质研究关键技术[J].地球物理学进展,2014,29(1):182-190.
[7]赵爽,李仲东,许红梅,等.多子波分解技术检测含煤砂岩储层[J].天然气工业,2007,27(9):44-47.
[8]秦雪菲,李巍.大牛地气田煤系地层去煤影响储层预测技术[J].吉林大学学报:地球科学版,2014,44(3):1048-1054.
[9]张永刚.地震波阻抗反演技术的现状和发展[J].石油物探,2002,41(4):385-390.
[10]王延光.储层地震反演方法以及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303.
[11]季玉新,刘春园,陈冬,等.分频反演方法及其在塔河A区储层预测中的应用[J].石油与天然气地质,2010,31(1):38-42.
[12]常炳章,王艳,辛利波.分频反演技术在泌阳凹陷井楼-高庄地区的应用[J].石油与天然气学报,2008,30(2):463-465.
[13]黄林军,潘建国,黄玉,等.分频反演技术在准东XIQ地区古沟谷薄砂层储层预测中的应用[J].石油与天然气学报,2012,34(11):52-55.
[14]于建国,韩文功,刘力辉.分频反演方法及应用[J].石油地球物理勘探,2006,41(2):193-197.
[15]陶倩倩,李达,杨希冰,等.利用分频反演技术预测烃源岩[J].石油地球物理勘探,2015,50(4):706-713.
[16]王振卿,王宏斌,张虎权,等.分频波阻抗反演技术在塔中西部台内滩储层预测中的应用[J].天然气地球科学,2014,25(11):1847-1854.
[17]高静怀,陈文超,李幼铭,等.广义S变换与薄互层地震响应[J].地球物理学报,2003,46(4):526-532.
[18]张廷章,尹寿鹏,张巧玲,等.地震分频技术的地质内涵及其效果分析[J].石油勘探与开发,2006,33(1):64-66.
[19]徐丽英,徐鸣洁,陈振岩.利用谱分解技术进行薄储层预测[J].石油地球物理勘探,2006,41(3):299-302.
[20]齐宇,刘震,魏建新,等.基于小波变换的谱分解技术在地震模型解释中的应用[J].新疆石油地质,2010,31(3):417-419.