川东北地区礁滩相储层预测技术与应用
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摘要
随着地质认识的深入和勘探思路的转变,川东北地区在原来认为是勘探不利区的海槽相区,相继发现了飞仙关组鲕滩孔隙型气藏、长兴组礁滩孔隙型气藏,探明了普光特大型气田。钻探表明,川东北地区长兴-飞仙关组气藏多为构造-岩性复合型气藏,加强储层预测研究是取得勘探成功的关键。为此,在达县-宣汉地区利用高分辨率三维地震资料,采用古地貌分析、地震相分析和多属性分析技术进行了礁滩相储层展布预测;应用地震波阻抗反演方法、岩性反演方法对礁滩相储层孔隙度、有效厚度进行了定量预测。在长兴组和飞仙关组预测储层发育区,毛坝3井、普光5井、普光6井均钻获长兴组礁滩相优质储层,完井测试获高产天然气流;大湾1井、大湾2井钻获飞仙关鲕滩优质储层:预测结果与钻探结果吻合。将以上方法技术应用于通南巴构造带和元坝地区,预测元坝地区可能发育大规模的礁滩相储层,是勘探有利区。
Northeast region of Sichuan province was formerly regarded as trough facies,and was not beneficial to prospecting.But now, many gas reservoirs has been discovered in this region,including oolitic-beach porous gas reservoir of Feixianguan group,reef-flat porous gas reservoir of Changxing group and Puguang oversize gas field.The exploratory drilling shows that the gas reservoirs of Changxing-Feixianguan group in northeast Sichuan province are most of structural-lithological gas reservoirs.The key of successful prospecting is the continual study of reservoir prediction.There- fore,in Daxian-Xuanhan area,high-resolution 3-D seismic data was utilized to predict the distribution of reef-flat reservoirs,along with the techniques of paleogeomorphology analysis,seismic facies analysis and multi-attributes analysis.Impedance inversion and li- thological inversion were used to quantitatively predict the porosity and effective thickness of reef-flat reservoirs.In the predicted res- ervoir-developed region of Changxing-Feixianguan group,good reef-flat reservoirs of Changxing group have been drilled in well Maoha3,well Puguang5 and well Puguang6.High-production nat- ural gas flow has been obtained in drilling test.Good reef-flat res- ervoirs of Feixianguan group have been drilled in well Dawanl and Dawan2.The actual drilling results coincide with the prediction re- sults.The above method was applied in Tongnanba srtuctural belt and Yuanha region.This predicts that large-scale reef-flat reser- voirs may develop in Yuanha region and be beneficial to prospec- ting.
Northeast region of Sichuan province was formerly regarded as trough facies,and was not beneficial to prospecting.But now, many gas reservoirs has been discovered in this region,including oolitic-beach porous gas reservoir of Feixianguan group,reef-flat porous gas reservoir of Changxing group and Puguang oversize gas field.The exploratory drilling shows that the gas reservoirs of Changxing-Feixianguan group in northeast Sichuan province are most of structural-lithological gas reservoirs.The key of successful prospecting is the continual study of reservoir prediction.There- fore,in Daxian-Xuanhan area,high-resolution 3-D seismic data was utilized to predict the distribution of reef-flat reservoirs,along with the techniques of paleogeomorphology analysis,seismic facies analysis and multi-attributes analysis.Impedance inversion and li- thological inversion were used to quantitatively predict the porosity and effective thickness of reef-flat reservoirs.In the predicted res- ervoir-developed region of Changxing-Feixianguan group,good reef-flat reservoirs of Changxing group have been drilled in well Maoha3,well Puguang5 and well Puguang6.High-production nat- ural gas flow has been obtained in drilling test.Good reef-flat res- ervoirs of Feixianguan group have been drilled in well Dawanl and Dawan2.The actual drilling results coincide with the prediction re- sults.The above method was applied in Tongnanba srtuctural belt and Yuanha region.This predicts that large-scale reef-flat reser- voirs may develop in Yuanha region and be beneficial to prospec- ting.
引文
1李岩峰，刘殊，曾晓．川东飞仙关组鲕滩储层地震响应特征及预测[J]．石油物探，2005，44(3)：236～239
2吴大奎，陈晓超．利用地震资料对川东地区飞仙关鲕滩储层孔隙度的预测研究及效果分析[J]．天然气工业，2001，21(3)：34～36
3杨雨，张静．川东下三叠统飞仙关组鲕滩分布及其天然气勘探前景[J]．成都理工学院学报．2001，27(增)：147～150
4元军，尹兵祥，徐筱兵等．四川盆地铁山坡地区飞仙关组鲕滩储层地震预测[J]．石油物探，2005，44(6)：617～620
5王一刚，张静，杨雨等．四川盆地东部上二叠统长兴组生物礁气藏形成机理[J]．海相油气地质，2000，5(2)：145～152
6彭勇，肖姹莉．四川开江黄龙场、渡口河地区地震储层预测研究[J]．天然气勘探与开发，2001，24(1)：1～8
7蒲勇，陈祖庆，田江．地震属性技术在碳酸盐岩鲕滩储层预测中的应用[J]．石油物探，2004，43(增刊)：62～66
8王罗兴，谢芳．川东北飞仙关组鲕滩气藏地震响应特征及勘探展望[J]．天然气工业，2000，20(5)：26～28
9刘殊，郭旭升，马宗晋等．礁滩相地震响应特征和油气勘探远景[J]．石油物探，2006，45(5)：452～458
2吴大奎，陈晓超．利用地震资料对川东地区飞仙关鲕滩储层孔隙度的预测研究及效果分析[J]．天然气工业，2001，21(3)：34～36
3杨雨，张静．川东下三叠统飞仙关组鲕滩分布及其天然气勘探前景[J]．成都理工学院学报．2001，27(增)：147～150
4元军，尹兵祥，徐筱兵等．四川盆地铁山坡地区飞仙关组鲕滩储层地震预测[J]．石油物探，2005，44(6)：617～620
5王一刚，张静，杨雨等．四川盆地东部上二叠统长兴组生物礁气藏形成机理[J]．海相油气地质，2000，5(2)：145～152
6彭勇，肖姹莉．四川开江黄龙场、渡口河地区地震储层预测研究[J]．天然气勘探与开发，2001，24(1)：1～8
7蒲勇，陈祖庆，田江．地震属性技术在碳酸盐岩鲕滩储层预测中的应用[J]．石油物探，2004，43(增刊)：62～66
8王罗兴，谢芳．川东北飞仙关组鲕滩气藏地震响应特征及勘探展望[J]．天然气工业，2000，20(5)：26～28
9刘殊，郭旭升，马宗晋等．礁滩相地震响应特征和油气勘探远景[J]．石油物探，2006，45(5)：452～458
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