东营凹陷沙三中亚段超隐蔽浊积岩储层描述方法及应用  

Description Methods and Application of High Subtle Turbidite Reservoir of E2S23 in Dongying Depression

作　　者：沈正春[1] 张云银[1] 魏红梅[1] 张建芝[1] 罗荣涛[1] 王甜[1] 商伟[1] SHEN Zheng-chun;ZHANG Yun-yin;WEI Hong-mei;ZHANG Jian-zhi;LUO Rong-tao;WANG Tian;SHANG Wei(Geophysical Research Institute of Shengli Oilfield,SINOPEC,Dongying 257022,China)

机构地区：[1]中国石化胜利油田分公司物探研究院,东营257022

出　　处：《科学技术与工程》2020年第18期7167-7175,共9页Science Technology and Engineering

基　　金：国家科技重大专项(2017ZX05072)。

摘　　要：东营凹陷浊积岩油藏勘探开发进入高程度阶段后,研究对象转为"个体小(单砂体面积<1 km^2)、厚度薄(单层厚度2~5 m,累加厚度5~15 m)、橫变快、含灰质(灰地比5%~45%)"的超隐蔽储层,该类储层常规方法描述难度大、精度低。因此,开展了超隐蔽储层描述技术综合研究:①应用谐波拓频技术、属性融合方法和波形指示反演技术刻画"个体小"和"厚度薄"储层;②形成了复杂岩性背景下横波估算方法,开展叠后、叠前综合去灰技术研究,刻画灰质发育区有利储层边界。取得了四点成果及认识:①谐波拓频技术提高了地震资料分辨率,且具有较高保真性,能够识别追踪厚度>10 m储层;②波形指示反演技术刻画薄互层储层精度较高,单层厚度>5 m砂体预测结果与实钻井吻合度为88.5%,厚度2~5 m储层预测吻合率80.2%;③复杂岩性环境下横波估算方法,较传统的Xu-White模型方法横波估算精度提高了10%;④叠后、叠前联合储层预测技术在东营凹陷去除灰质的精度为84%。综合应用储层描述成果,在四个开发区块共部署滚动探井20口,目前完钻10口,8口井钻遇较厚油层,其中6口井投产后均获商业油流,新建产能约4.0×10~4 t。After the exploration and development of turbidite reservoir in Dongying depression entered a high-degree exploration stage, the object of study has been transformed into an ultrasubtle reservoir that is small sized(area of single sand body<1 km^2) and thin(thickness of single layer 2~5 m, cumulative thickness is 5~15 m), with rapid lateral facies change and limestone content(proportion of limestone 5%~45%). It is difficult to describe such a reservoir with conventional methods that are in low accuracy. Therefore, a comprehensive study on the description technology of such ultrasubtle reservoir was carried out. Firstly, the techniques of harmonic frequency extension, attribute fusion, and waveform indication inversion were used to describe the reservoirs with small and thin individuals. Secondly, by using the S-wave estimation method in the background of complex lithology, the comprehensive method of post-stack and pre-stack limestone removal technology were studied to depict the favorable reservoir boundary in the limestone developed area. Four achievements and understandings were achieved. The harmonic frequency extension technology improve the resolution of seismic data in high fidelity, which can identify and trace reservoirs with thickness >10 m. The waveform indication inversion technology has a high accuracy in depicting thin interbedded reservoir. The successful prediction of sand body with thickness of single layer >5 m reaches 88.5%, and the prediction coincidence rate of reservoir with thickness of 2~5 m is 80.2%. Compared with the traditional Xu-White model, the accuracy of S-wave estimation in a complex lithologic environment was improved by 10%. The precision of limetone matter removal in the Dongying depression is 84%. Based on the reservoir description results, a total of 20 exploration wells are deployed in four development blocks. At present, 10 wells are been drilled and 8 wells have encountered thick oil layers. Six wells have obtained commercial oil flow after being put into operation, with a

关 键 词：超隐蔽浊积岩 储层描述 谐波拓频 波形指示反演 叠前反演 东营凹陷 

分 类 号：P618.13[天文地球—矿床学]