靖边气田奥陶系沟槽精细刻画及其与天然气富集关系
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摘要
靖边气田勘探开发实践表明,井间沟槽展布特征对开发钻井成功率具有重要影响。综合运用实钻井地层对比法、地震波形识别法及时窗滑移法对工区内古沟槽展布特征进行精细刻画,识别出10条一级沟槽、68条二级沟槽和376条三级沟槽。沟槽发育对储层物性既有建设性作用又有破坏性作用。建设性作用表现为:沟槽上方的斜坡区,由于沟槽的存在,往往水动力能量高,岩溶作用强烈,储层物性较好;破坏作用表现在:岩溶斜坡遭受切割而缺失主力气层,使得储层不能大面积连续含气。沟槽发育部位是古水流的指向区域,溶蚀作用相对较弱,储层致密,物性差。同时,沟槽对天然气富集控制作用明显,统计发现沟槽内部井平均无阻流量仅为0.9×104m3/d,沟槽外部井平均无阻流量则高达20.1×104m3/d。
It has been verified by exploration and development practice that the distributing feature of erosion flutes has important influence on success rate of drilling. In order to determine the distributing feature of erosion flutes, strata antithesis,seismic waveform analysis and time window slip methods were used. There are 10 primary, 68 secondary and 376three-level valley troughs were recognized. The development of groove have both favorable and unfavorable influence on reservoir. On the one hand the reservoir besides erosion flutes has higher porosity and permeability for the strong karstification, on the other hand in erosion flutes tight reservoir often development due to the paleocurrent and faint dissolution.Meanwhile, the erosion flutes have control action on gas enrichment. The well's average open flow capacity was 0.9×104m3/d when it in the erosion flutes, but 20.1×104m3/d outside erosion flutes.
It has been verified by exploration and development practice that the distributing feature of erosion flutes has important influence on success rate of drilling. In order to determine the distributing feature of erosion flutes, strata antithesis,seismic waveform analysis and time window slip methods were used. There are 10 primary, 68 secondary and 376three-level valley troughs were recognized. The development of groove have both favorable and unfavorable influence on reservoir. On the one hand the reservoir besides erosion flutes has higher porosity and permeability for the strong karstification, on the other hand in erosion flutes tight reservoir often development due to the paleocurrent and faint dissolution.Meanwhile, the erosion flutes have control action on gas enrichment. The well's average open flow capacity was 0.9×104m3/d when it in the erosion flutes, but 20.1×104m3/d outside erosion flutes.
引文
[1]郭刚.长庆靖边气田陕155井区下奥陶统马家沟组马五1储层特征研究[J].天然气勘探与开发,2006,29(3):26-29.
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[3]陈凤喜,王东旭.靖边气田马五41储层成岩作用及孔隙演化[J].天然气勘探与开发,2012,35(1):22-26.
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[5]何自新,郑聪斌,陈安宁,等.长庆气田奥陶系古沟槽展布及其对气藏的控制[J].石油学报,2001,22(4):35-38.
[6]代金友,史若珩,何顺利,等.鄂尔多斯盆地中部气田沟槽识别新方法[J].天然气工业,2006,26(4):26-28.
[7]侯方浩,方少仙,何江,等.鄂尔多斯盆地靖边气田区中奥陶统马家沟组五1-五4亚段古岩溶型储层分布特征及综合评价[J].海相油气地质,2011,16(1):1-13.
[8]戴金星,李剑,罗霞,等.鄂尔多斯盆地大气田的烷烃气碳同位素组成特征及其气源对比[J].石油学报,2005,26(3):18-26.
[9]徐波,孙卫,宴宁平,等.鄂尔多斯盆地靖边气田沟槽与裂缝的配置关系对天然气富集程度的影响[J].现代地质,2009,23(2):299-304.
[2]李振宏,郑聪斌.古岩溶演化过程及对油气储集空间的影响-以鄂尔多斯盆地奥陶系为例[J].天然气地球科学,2004,15(3):247-252.
[3]陈凤喜,王东旭.靖边气田马五41储层成岩作用及孔隙演化[J].天然气勘探与开发,2012,35(1):22-26.
[4]徐世琦,邓洪斌,洪海涛,等.长庆气田奥陶系岩溶古地貌对气藏的控制作用[J].天然气勘探与开发,2001,24(4):1-6.
[5]何自新,郑聪斌,陈安宁,等.长庆气田奥陶系古沟槽展布及其对气藏的控制[J].石油学报,2001,22(4):35-38.
[6]代金友,史若珩,何顺利,等.鄂尔多斯盆地中部气田沟槽识别新方法[J].天然气工业,2006,26(4):26-28.
[7]侯方浩,方少仙,何江,等.鄂尔多斯盆地靖边气田区中奥陶统马家沟组五1-五4亚段古岩溶型储层分布特征及综合评价[J].海相油气地质,2011,16(1):1-13.
[8]戴金星,李剑,罗霞,等.鄂尔多斯盆地大气田的烷烃气碳同位素组成特征及其气源对比[J].石油学报,2005,26(3):18-26.
[9]徐波,孙卫,宴宁平,等.鄂尔多斯盆地靖边气田沟槽与裂缝的配置关系对天然气富集程度的影响[J].现代地质,2009,23(2):299-304.
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