基于动静态信息融合的辫状河储层构型表征及地质建模技术  

Static and dynamic information fusion based reservoir architecture characterization and 3D geological modeling technology for braided river reservoirs

作　　者：马志欣[1,2] 吴正[3] 张吉[1,2] 白玉奇 李浮萍[1,2] 付斌[1,2] 白慧[1,2] MA Zhixin;WU Zheng;ZHANG Ji;BAI Yuqi;LI Fuping;FU Bin;BAI Hui(National Engineering Laboratory of Low-Permeability Oil&Gas Exploration and Development,Xi'an,Shaanxi 710018,China;Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China)

机构地区：[1]低渗透油气田勘探开发国家工程实验室 [2]中国石油长庆油田公司勘探开发研究院 [3]中国石油长庆油田公司

出　　处：《天然气工业》2022年第1期146-158,共13页Natural Gas Industry

基　　金：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(编号:2016ZX05050);中国石油天然气股份有限公司重大科技专项“长庆气田稳产及提高采收率技术研究”(编号:2016E-0509)。

摘　　要：辫状河储层是鄂尔多斯盆地苏里格气田开发的主要对象,受储层砂体规模小及井网井距限制的双重影响,储层定量表征难度大,砂体规模论证缺乏有力证据,表征结果可靠性不高。为此,以苏里格气田SSF密井网区石盒子组盒8下亚段(以下简称盒8下亚段)为例,在充分挖掘干扰试井资料蕴含的地质信息的基础上,结合测井、录井资料,开展基于多源信息融合储层构型解剖,论证了不同级别砂体规模及连通关系,为高精度三维地质建模提供有效支撑并取得较好的应用效果。研究结果表明:①该密井网区辫状河道宽度下限约1010.0m,心滩砂体长度下限约650.3m;②辫流水道的砂质充填能够沟通相邻心滩砂体,泥质充填则对相邻心滩砂体间流体渗流起到阻隔作用,充填类型直接影响了相邻心滩砂体连通性;③参照表征结果,结合压降传播速率,建立了4种砂体连通模式;④在激动井为同一口井的干扰井组中,压降传播速度以单砂体内部连通模式最快,井间砂质辫流水道连通次之,河道下切连通模式最慢;⑤高精度地质模型实现了井位优化部署及水平井轨道设计,在井位动态跟踪和随钻地质导向方面应用效果较好。结论认为,基于动静态信息融合的辫状河储层构型表征及地质建模技术,不仅能够为砂体规模论证提供有力的证据,而且对三维地质建模起到很好的指导作用,对气田有效开发及提高采收率具有十分重要的意义。Braided river reservoir is the main development object in Sulige Gas Field of the Ordos Basin. Due to the dual influence from the small scale of reservoir sandbodies and the limitation of well patterns and well spacing, it is difficult to quantitatively characterize the reservoir, and the demonstration of sandbody scale lacks strong evidence, so the characterization result is unreliable. Taking the lower submember of 8 th Member of Shihezi Formation in the SSF dense well pattern area of Sulige Gas Field as an example, this paper carries out multi-source information fusion based reservoir architecture characterization by mining geological information from interference well test data as much as possible, combined with wireline log and mud log data. In addition, the scale and connection relationship of different levels of sandbodies are demonstrated, which provides effective support for high-precision 3 D geological modeling and achieves a better application effect. And the following research results are obtained. First, the minimum width of braided channel and the minimum length of point bar sandbody in this dense well pattern area are about 1 010.0 m and 650.3 m, respectively. Second, filling types have a direct effect on the connectivity between adjacent point bar sandbodies. The sand filling in the braided channels can connect the adjacent point bar sandbodies, while the mud filling acts as a barrier to the fluid flow between adjacent point bar sandbodies. Third, four sandbody connection modes are established based on the characterization results, combined with the propagation rate of pressure drop. Fourth, in the interference well group with the same well as the active well, the propagation of pressure drop in the connection mode of internal single sandbody is the fastest, followed by the connection mode of inter-well sandy braided water channels, and that in the connection mode of channel undercutting is the slowest. Fifth, optimal well location deployment and horizontal well trajectory design are realized bas

关 键 词：苏里格气田 储层构型表征 干扰试井 信息融合 砂体规模 连通模式 三维地质建模 

分 类 号：TE37[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]