水平井网下基于地质统计学反演的辫状河储层隔夹层精细刻画——以渤海辽中凹陷LD-A油田馆陶组为例  

Geostatistical inversion-based fine characterization of interlayers in braided river reservoirs for horizontal well pattern:Taking Guantao Formation of LD-A oilfield in Liaozhong Sag,Bohai sea as an example

作　　者：刘宗宾 吕文杰 廖新武 朱建敏 高红立 LIU Zongbin;LYU Wenjie;LIAO Xinwu;ZHU Jianmin;GAO Hongli(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2022年第3期71-81,共11页China Offshore Oil and Gas

基　　金：中海石油(中国)有限公司综合科研项目“渤海典型稠油油藏热采提高采收率及关键工艺技术研究(编号:YXKY-2021-TJ-01)”部分研究成果。

摘　　要：渤海辽中凹陷LD-A油田新近系馆陶组为辫状河沉积,隔夹层类型多,储层连通性复杂,对隔夹层的精确刻画是规避钻井风险和提高油田开发效果的关键。综合利用测井和地震资料,从隔夹层成因及类型出发,充分考虑水平井网的特殊性,重构拟声波曲线提高测井对薄夹层的识别能力,利用变差椭圆求取平面变差参数,在基于模型的稀疏脉冲确定性反演的约束下,通过地质统计学反演技术,对LD-A油田4井区馆Ⅳ油组的辫状河厚储层内部隔夹层进行了三维精细刻画。结果表明,LD-A油田辫状河储层隔夹层可划分为泛滥泥、落淤层、废弃河道泥和底部滞留沉积4类,其中泛滥泥为层间泥岩,落淤层、废弃河道泥和底部滞留沉积为层内泥岩;层间泥岩空间分布较为稳定,纵向遮挡效果好,层内泥岩呈零星片状分布,起局部渗流屏障作用;地质统计学反演拾取了确定性反演对层间泥岩的响应趋势,融入水平段信息后又对层内薄夹层的空间展布起到了有效的控制作用,充分发挥了地震反演和随机建模的优势。本文研究有效指导了钻井实施和分层系水平井挖潜,取得了较好的开发效果。The Neogene Guantao Formation in the LD-A oilfield of the Liaozhong Sag,Bohai sea belongs to a braided river deposit with numerous types of interlayers and complex reservoir connectivity.The fine characterization of the interlayers is the key to avoiding drilling risks and improving oilfield development effects.Starting from the geneses and types of interlayers and fully considering the particularity of the horizontal well pattern,comprehensive use of logging and seismic data allows for an higher logging identification of thin interlayers by reconstructing the pseudo-acoustic curves.Using the variation ellipse to obtain plane variation parameters,under the constraints of model-based sparse pulse deterministic inversion,a three-dimensional fine characterization of the internal interlayers of the braided river thick reservoir was carried out for the Guan IV oil group of the No.4 well block,LD-A oilfield by virtue of geostatistical inversion technology.The results show that the interlayers of braided river reservoirs in LD-A oilfield can be divided into four types:flooding mud,falling silt layer,abandoned channel mud and bottom stagnant sediments.Among them,the flooding mud is spacer interlayer,and the falling layer,abandoned channel mud and bottom retained sediment are sand interlayer.The interlayer mudstone has a relatively stable spatial distribution and good vertical shielding effect,and the intralayer mudstone is distributed in sporadic flakes,acting as a local seepage barrier.The geostatistical inversion has picked up the response trend of deterministic inversion on spacer interlayer.The interlayer,after being integrated into the information of horizontal section,plays an effective role in controlling the spatial distribution of thin interlayers within the layer,giving full play to the advantages of seismic inversion and stochastic modeling.The research in this paper has effectively guided the drilling implementation and the potential tapping of layered horizontal wells,and has achieved good development result

关 键 词：馆陶组 辫状河 隔夹层 水平井 地质统计学反演 

分 类 号：TE321[石油与天然气工程—油气田开发工程]