利用弹性参数预测礁、滩相储层
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摘要
受地质情况复杂和地震资料分辨率低的限制,对川东北YB地区长兴组礁、滩相储层分布规律的成功研究史例很少。文中以现有的钻井、地质和地震资料为基础,详细描述了该区礁、滩相储集体的沉积特征,分析了弹性参数与储层的含油气关系,搞清了礁、滩相储层的空间展布规律,并得出以下认识:①YB地区台地边缘礁、滩相储层可分为上、下两套储层,上储层以礁盖白云岩为主,下储层以礁后生物滩屑储层及早期生屑滩储层为主。②长兴组含气储层表现为低纵波速度、低弹性模量和低泊松比特征,而不含气储层则相反;随着孔隙度的增高,纵波速度、弹性模量和泊松比都有不同程度的降低。基于储层预测结果部署的针对礁、滩相的钻井大多数都获得了工业气流,长兴组储层段都表现出低泊松比特征,符合Ⅱ、Ⅲ类含气储层的划分依据,储层预测结果与钻井情况吻合较好。
Limited by complicated geology conditions and low seismic data resolution,there are only a very few successful study cases for the distribution of Changxin Group reef&beach facies in YB area of Northwest of Sichuan.Based on available drilling data,the geological data and seismic data,the sediment characteristics of the reef-beach facies reservoir in this area were described in detailed,the relation between the elastic parameters and the oil&gas bearing property of the reservoir was analyzed,the spatial distribution of the reef-beach facies were fully understood,and the following conclusions were obtained:(1)There are upper set and lower set of reservoirs for the reef&beach facies reservoir in the margin of the platform in YB area,the upper one is mainly a reef top dolomite,the lower set is mainly consist of the backreef biological beach debris reservoir and the early biological beach debris reservoir;(2)The gas bearing reservoir for Changxin Group shows low P-wave velocity,low elastic modulus and low Passion Ratio,the non-gas bearing reservoir is just opposite,with increase of the porosity,the P-wave velocity,the elastic modulus and Passion Ratio all decrease in different extent.For most wells which were drilled based on the reservoir prediction results industry gas was obtained,the Changxin reservoir sections all show low Passion ratio characteristic,which match the classification basis for first type and second type gas-bearing reservoir.
Limited by complicated geology conditions and low seismic data resolution,there are only a very few successful study cases for the distribution of Changxin Group reef&beach facies in YB area of Northwest of Sichuan.Based on available drilling data,the geological data and seismic data,the sediment characteristics of the reef-beach facies reservoir in this area were described in detailed,the relation between the elastic parameters and the oil&gas bearing property of the reservoir was analyzed,the spatial distribution of the reef-beach facies were fully understood,and the following conclusions were obtained:(1)There are upper set and lower set of reservoirs for the reef&beach facies reservoir in the margin of the platform in YB area,the upper one is mainly a reef top dolomite,the lower set is mainly consist of the backreef biological beach debris reservoir and the early biological beach debris reservoir;(2)The gas bearing reservoir for Changxin Group shows low P-wave velocity,low elastic modulus and low Passion Ratio,the non-gas bearing reservoir is just opposite,with increase of the porosity,the P-wave velocity,the elastic modulus and Passion Ratio all decrease in different extent.For most wells which were drilled based on the reservoir prediction results industry gas was obtained,the Changxin reservoir sections all show low Passion ratio characteristic,which match the classification basis for first type and second type gas-bearing reservoir.
引文
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[2]王生海,强子同.四川华蓥山涧水沟上二叠统生物礁.石油与天然气地质,1992,12(2):147～154
[3]范嘉松,吴亚生.川东二叠纪生物礁再认识.石油与天然气地质,2002,23(1):12～18
[4]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.海相油气地质,1997,5(1):145～152
[5]王一刚,文应初,张帆.川东地区上二叠统长兴组生物礁分布规律.天然气工业,1998,18(6):10～15
[6]牟传龙,谭钦银,余谦等.川东北地区上二叠统长兴组生物礁组成及成礁模式.沉积与特提斯地质,2004,24(3):65～71
[7]牟传龙,马永生,余谦等.四川宣汉盘龙洞生物礁古油气藏油气源分析.石油实验地质,2005,27(6):570～574
[8]马永生,牟传龙,郭彤楼.四川盆地东北部长兴组层序地层与储层分布.地学前缘,2005,12(3):179～185
[9]马永生,牟传龙,郭旭升等.川东北地区长兴组沉积特征与沉积格局.地质论评,2006,52(1):25～29.
[10]王瑞华,牟传龙,谭钦银等.达县—宣汉地区长兴组礁滩白云岩成岩作用与成岩环境研究.沉积与特提斯地质,2006,26(1):30～36
[11]耿威,郑荣才,李爽等.开江—梁平台内海槽东段长兴组礁、滩相储层特征.成都理工大学学报,2008,35(6):639～647
[12]王涛,朱祥,谭代英.毛坝构造飞仙关组裂缝储层综合预测方法.石油物探,2009,48(4):383～389
[13]曹孟起,王九栓,邵林海.叠前弹性波阻抗反演技术及应用.石油地球物理勘探,2006,41(3):323～326
[14]彭真明,李亚林,梁波等.叠前弹性阻抗在储层气水识别中的应用.天然气工业,2007,38(4):43～45,52
[15]刘卫华,高建虎,陈启艳等.苏里格气田某工区储层预测可行性研究.岩性油气藏,2009,21(2):94～98
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