鄂尔多斯盆地延长探区奥陶纪末古地貌恢复与储层预测
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摘要
延长探区下古生界奥陶系马家沟组天然气勘探获得重大突破,勘探显示含气层的发育和分布与奥陶系顶沟槽古地貌关系密切。通过马家沟组钻井小层的精细划分与对比、制作不整合面上具填平补齐作用的本溪组厚度图、侵蚀沟谷正演模拟结果进行地震剖面沟谷识别以及地震反演等技术手段,综合编制前上古生界古地质图,在探区内识别出了两个北西-南东向奥陶系顶面侵蚀沟槽。综合分析古地貌图与波阻抗平面图显示,奥陶系低波阻抗显示的有利储层分布与侵蚀沟谷及其两侧的侵蚀斜坡位置吻合,也与目前的奥陶系产气井和有利油气显示井的位置吻合;甘泉地区的Y112井附近、工区西北方向的Y113-Y101井及工区中部Y118-Y119-Y108井一带有利储层发育,应为奥陶系下一步勘探部井的重点区域。
Major breakthroughs have been achieved in gas exploration in the Ordovician Majiagou Formation in Yanchang exploration area.These discoveries show that the development and distribution of gas-bearing layers have a close relationship with the furrow erosion palaeogeomorphology on top of the Ordovician.By using such techniques such as fine subdivision and correlation of the Majiagou Formation,thickness mapping of the Benxi Formation on the unconformity,forward modeling-based identification of eroded furrows on seismic section,and seismic inversion,we mapped the paleogeology of the pre-Upper Paleozoic and recognized two NW-SE trending eroded furrows on top of the Ordovician.The comprehensive analysis of the paleogeomorphogloic map and wave impedance map shows that the distribution of favorable reservoirs with low wave impedance in the Ordovician is consistent with the locations of erosion furrows and the eroded slopes on both sides.Moreover,it is also consistent with the locations of wells that produce gas from the Ordovician and that have favorable oil/gas shows.The research indicates that favorable reservoirs occur near Y112 well in Ganquan area,Y113-Y101 wells in the northwest of the study area and Y118-Y119-Y108 wells in central of the study area.These areas should be the major target areas for further exploration of the Ordovieian.
Major breakthroughs have been achieved in gas exploration in the Ordovician Majiagou Formation in Yanchang exploration area.These discoveries show that the development and distribution of gas-bearing layers have a close relationship with the furrow erosion palaeogeomorphology on top of the Ordovician.By using such techniques such as fine subdivision and correlation of the Majiagou Formation,thickness mapping of the Benxi Formation on the unconformity,forward modeling-based identification of eroded furrows on seismic section,and seismic inversion,we mapped the paleogeology of the pre-Upper Paleozoic and recognized two NW-SE trending eroded furrows on top of the Ordovician.The comprehensive analysis of the paleogeomorphogloic map and wave impedance map shows that the distribution of favorable reservoirs with low wave impedance in the Ordovician is consistent with the locations of erosion furrows and the eroded slopes on both sides.Moreover,it is also consistent with the locations of wells that produce gas from the Ordovician and that have favorable oil/gas shows.The research indicates that favorable reservoirs occur near Y112 well in Ganquan area,Y113-Y101 wells in the northwest of the study area and Y118-Y119-Y108 wells in central of the study area.These areas should be the major target areas for further exploration of the Ordovieian.
引文
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[12]王士敏,鲁新便.塔河油田碳酸盐岩储层预测技术[J].石油物探,2004,43(2):153-158. Wang Shimin,Lu Xinbian.Prediction techniques for deep carbonate reservoirs in Tahe Oilfield[J].Geophysical Prospecting For Petroleum,2004,43(2):153-158.
[13]王振卿,王宏斌,龚洪林,等.塔中地区碳酸盐岩储层预测技术[J].天然气技术,2009,3(1):23-26. Wang Zhenqing,Wang Hongbin,Gong Honglin.Reservoir Prediction Technologies of Carbonate Rock in Central Tarim Basin[J].Natural Gas Technology,2009,3(1 ):23 -26.
[14]吴俊峰,姚姚,撒利明.碳酸盐岩特殊孔洞型构造地震响应特征分析[J].石油地球物理勘探,2007,42(2):180- 185. Wu Junfeng,Yao Yao,Sa Liming.Analysis on seismic response of special cavernous structure of carbonate[J].Oil Geophysical Prospecting,2007,42(2):180-185.
[15]张明振,印兴耀,谭明友,等.对测井约束地震波阻抗反演的理解与应用[J].石油地球物理勘探,2007,42(6): 699-702. Zhang Mingzhen,Yin Xingyao,Tan Mingyou,et al.Realization and application of logging-constrained seismic wave impedance inversion[J].Oil Geophysical Prospecting,2007,42 (6):699-702.
[2]杨华,黄道军,郑聪斌.鄂尔多斯盆地奥陶系岩溶古地貌气藏特征及勘探进展[J].中国石油勘探,2006,11(3): 1-5. Yang Hua,Huang Daojun,Zheng Congbin.Characteristics of gas reservoir and exploration achievement for Ordovician paleokarst landform in Ordos Basin[J].China Petroleum Exploration, 2006,11(3):1 -5.
[3]何江,方少仙,侯方浩,等.鄂尔多斯盆地中部气田中奥陶统马家沟组岩溶型储层特征[J].石油与天然气地质, 2009,30(3):350-356. He Jiang,Fang Shaoxian,Hou Fanghao,et al.Characteristics of karst reservoirs in the Middle Ordovician Majiagou Formation of gas fields in the central Ordos Basin[J].Oil & Gas Geology, 2009,30(3):350-356.
[4]宁宁,陈孟晋,孙粉锦,等.鄂尔多斯盆地奥陶系风化壳古油藏的确定及其意义[J].石油与天然气地质,2007,28 (2):280-286. Ning Ning,Chen Mengjin,Sun Fengjin,et al.Determination and its significance of ancient oil pools in Ordovician weathering crust,Ordos basin[J].Oil & Gas Geology,2007,28 (2):280-286.
[5]周义军,杨遂正,王欣.鄂尔多斯盆地奥陶系顶面演化与岩溶储层[J].石油物探,2006,45(3):304-307. Zhou Yijun,Yang Suizheng,Wang Xin.The structural-interface evolution in Ordovician and karst reservoir in Ordos basin [J].Geophysical Prospecting for Petroleum,2006,45(3): 304-307.
[6]顾岱鸿,代金友,兰朝利,等.靖边气田沟槽高精度综合识别技术[J].石油勘探与开发,2007,34(1):60-64. Gu Daihong,Dai Jinyou,Lan Chaoli,et al.High-precision integrative recognition technology for flutings in Jingbian Gasfield, Ordos Basin[J].Petroleum Exploration and Development, 2007,34(1):60-64.
[7]樊政军,柳建华,张卫峰.塔河油田奥陶系碳酸盐岩储层测井识别与评价[J].石油与天然气地质,2008,29(1): 61-65. Fan Zhenjun,Liu Jianhua,Zhang Weifeng.Log interpretation ??and evaluation of the Ordovician carbonate rock reservoirs in Tahe oilfield[J].Oil & Gas Geology,2008,29(1 ):61 - 65.
[8]凌云研究组.测井与地震信息标定研究[J].石油地球物理勘探,2004,39(1):68-74. Ling Yun.Study of logging and seismic information labeling [J].Oil Geophysical Prospecting,2004,39(1):68 -74.
[9]邹新宁,孙卫,张盟勃,等.鄂尔多斯盆地奥陶系侵蚀沟谷及顶面形态识别[J].西北大学学报(自然科学版), 2006,36(4):610-614. Zou Xinning,Sun We,Zhang Mengbo,et al.Recognition of eroded channel-vale and top fluctuant configuration for Ordovician in Ordos Basin[J].Journal of Northwest University(Natural Science Edition),2006,36(4):610 -614.
[10]何自新,黄道军,郑聪斌.鄂尔多斯盆地奥陶系古地貌、古沟槽模式的修正及其地质意义[J].海相油气地质,2006, 11(2):25-28. He Zixin,Huang Daojun,Zheng Congbin.Modification and geology implication of Ordovician paleogeomorphology and paleogeosyncline distribution models in Ordos Basin[J].Marine Origin Petroleum Geology,2006,11(2):25 -28.
[11]王光付.碳酸盐岩溶洞型储层综合识别及预测方法[J].石油学报,2008,29(1):47-51. Wang Guangfu.Integrative identification and prediction methods for carbonate rock cave reservoir[J].Acta Petrolei Sinica, 2008,29(1):47-51.
[12]王士敏,鲁新便.塔河油田碳酸盐岩储层预测技术[J].石油物探,2004,43(2):153-158. Wang Shimin,Lu Xinbian.Prediction techniques for deep carbonate reservoirs in Tahe Oilfield[J].Geophysical Prospecting For Petroleum,2004,43(2):153-158.
[13]王振卿,王宏斌,龚洪林,等.塔中地区碳酸盐岩储层预测技术[J].天然气技术,2009,3(1):23-26. Wang Zhenqing,Wang Hongbin,Gong Honglin.Reservoir Prediction Technologies of Carbonate Rock in Central Tarim Basin[J].Natural Gas Technology,2009,3(1 ):23 -26.
[14]吴俊峰,姚姚,撒利明.碳酸盐岩特殊孔洞型构造地震响应特征分析[J].石油地球物理勘探,2007,42(2):180- 185. Wu Junfeng,Yao Yao,Sa Liming.Analysis on seismic response of special cavernous structure of carbonate[J].Oil Geophysical Prospecting,2007,42(2):180-185.
[15]张明振,印兴耀,谭明友,等.对测井约束地震波阻抗反演的理解与应用[J].石油地球物理勘探,2007,42(6): 699-702. Zhang Mingzhen,Yin Xingyao,Tan Mingyou,et al.Realization and application of logging-constrained seismic wave impedance inversion[J].Oil Geophysical Prospecting,2007,42 (6):699-702.
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