摘要
渤中19-6气田潜山储层储集空间类型复杂多样,除发育粒间孔、溶蚀孔以外,裂缝十分发育,导致储层具有较强的非均质性,使得不同探井之间测试产能差异较大,因此有效评价储层裂缝的发育情况至关重要。本文利用快、慢横波速度差异计算得到地层的各向异性大小,通过电成像测井获取的裂缝密度进行标定,建立了渤中19-6气田评价近井地层裂缝发育程度的各向异性判别标准,使声波各向异性评价地层裂缝由定性发展到半定量,弥补了电成像测井质量差时难以识别裂缝的不足。在此基础上,首次将偶极横波远探测技术应用到变质岩潜山地层中探测井外数十米内的大尺度裂缝,建立了一套由近及远、纵横结合的裂缝测井评价技术体系,从而为该气田裂缝准确评价及后续高效开发提供了有力支持。
The buried hill reservoir of BZ19-6 gas field has complex and diverse reservoir space types.In addition to intergranular pores and dissolution pores,fractures are also well developed,which leads to the strong heterogeneity of the reservoir and the large difference of test productivity between different exploration wells.Therefore,it is of great significance to effectively evaluate the development of reservoir fractures.In this paper,the anisotropy of formation is calculated by using the velocity difference between fast and slow shear waves,and the anisotropy criterion for evaluating the fracture development degree of near wellbore formation in BZ19-6 gas field is established by calibrating the fracture density obtained by electrical imaging logging,which makes the evaluation of formation fractures by acoustic anisotropy change from qualitative to semi-quantitative,making up for the lack of identification of fractures when the quality of electrical imaging logging is poor.On this basis,the dipole shear wave far detection technology is applied to detect the large-scale fractures within tens of meters outside the well in the metamorphic buried hill formation for the first time,and a set of logging evaluation technology system for fractures from near to far and combining vertical and horizontal is established,which provides strong support for accurate fracture evaluation and subsequent efficient development of the gas field.
作者
秦瑞宝
曹景记
李雄炎
魏丹
汪鹏
平海涛
QIN Ruibao;CAO Jingji;LI Xiongyan;WEI Dan;WANG Peng;PING Haitao(CNOOC Research Institute Ltd., Beijing 100028, China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第3期77-84,共8页
China Offshore Oil and Gas
基金
国家自然基金企业创新发展联合基金项目“渤海潜山裂缝性储层地震响应机理及精确成像方法(编号:U19B2008)”
中海石油(中国)有限公司联合攻关项目“渤中19-6变质岩潜山储层测井评价关键技术研究与应用(编号:YSLH-ZX-01-2021)”
中海石油(中国)有限公司科技项目“渤中19-6潜山低渗凝析气藏高效开发技术研究(编号:YXKY-ZX-07-2021)”部分研究成果。
关键词
变质岩潜山
裂缝发育程度
声波测井评价
横波各向异性
偶极横波远探测
产能评价
渤中19-6气田
metamorphic buried hill
fracture development degree
acoustic logging evaluation
shear wave anisotropy
dipole shear-wave far detection
productivity evaluation
BZ19-6 gas field
作者简介
第一作者:秦瑞宝,男,教授级高级工程师,1987年毕业于原江汉石油学院矿场地球物理测井专业,获学士学位,长期从事测井资料处理、解释及研究工作,地址:北京市朝阳区太阳宫南街6号院(邮编:100028),E-mail:qinrb@cnooc.com.cn。
