综合开发技术在东方气田的应用
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摘要
东方气田储层非均质性强,尤其是一期生产井钻后表现更为突出,在2D地震资料道积分剖面或常规反演地震剖面上,显示储层分布稳定、连续性好,井间无断层存在,但气体组分差异却很大。针对这些问题,东方气田在二期开发实施前,进行了储层的精细描述,一方面采集了高分辨率三维地震资料,通过特殊处理及反演技术,精细刻画砂体及隔夹层分布;另一方面从储层沉积学角度研究砂体的展布、隔夹层的成因及储层内部的非均质性。在此基础上对开发井进行精细的井位优化和调整,尤其是针对低阻气层,采用大位移水平井开发。在实施中利用水平井随钻技术、优化配产技术和地质建模、数模一体化等技术,保证了生产井水平段的有效长度,使气田开发井在投产后产能和组分均达到或超过设计要求,为气田产量达到ODP设计水平以及保持长期稳定地向下游供气打下了坚实的基础。
Reservoir in Dongfang gas field is of strong heterogeneity,which is especially obvious after the first production well drilling.On 2D seismic data trace integration sections or conventional retrieval seismic section,it shows stability and good continuity of reservoir distribution,and no faults between wells,however the difference of gas components is big.According to these problems,fine description of reservoir is done before implementation of second development of Dongfang gas field.On the one hand,high resolution 3d seismic data is collected,and sand body and interlayer distribution are characterized finely by special treatment and inversion technique.On the other hand,exhibition of the sand body,causes of septal interlayer and heterogeneity in reservoir are researched from reservoir sedimentology.Based on the above basis,fine well location optimization and adjustment are done for development well,and especially for low-resistivity gas reservoir large displacement horizontal well development is used.Many techniques such as random drilling technique with horizontal well,optimization of production allocation technique,geological modeling,analogue-digital integration and so on are used in implementation,which make the productivity and components of gas field development well meet or exceed the design requirements and provide solid foundation for gas field yield reaching ODP design level and keeping long and stable downstream gas supplying.
Reservoir in Dongfang gas field is of strong heterogeneity,which is especially obvious after the first production well drilling.On 2D seismic data trace integration sections or conventional retrieval seismic section,it shows stability and good continuity of reservoir distribution,and no faults between wells,however the difference of gas components is big.According to these problems,fine description of reservoir is done before implementation of second development of Dongfang gas field.On the one hand,high resolution 3d seismic data is collected,and sand body and interlayer distribution are characterized finely by special treatment and inversion technique.On the other hand,exhibition of the sand body,causes of septal interlayer and heterogeneity in reservoir are researched from reservoir sedimentology.Based on the above basis,fine well location optimization and adjustment are done for development well,and especially for low-resistivity gas reservoir large displacement horizontal well development is used.Many techniques such as random drilling technique with horizontal well,optimization of production allocation technique,geological modeling,analogue-digital integration and so on are used in implementation,which make the productivity and components of gas field development well meet or exceed the design requirements and provide solid foundation for gas field yield reaching ODP design level and keeping long and stable downstream gas supplying.
引文
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