致密低渗砂岩断缝体油藏地质储量计算  

Geological Reserves Estimation of Fault-Controlled Fracturing Reservoirs in Tight and Low-Permeability Sandstones

作　　者：王国壮[1] 骆杨[2,3] 陈红汉[3] 孟玉净 王旭[1] 赵彦超[3] Wang Guozhuang;Luo Yang;Chen Honghan;Meng Yujing;Wang Xu;Zhao Yanchao(North China Oil and Gas Branch,SINOPEC,Zhengzhou 450006,China;Laboratory of Theory and Technology of Petroleum Exploration and Development in Hubei Province,China University of Geosciences,Wuhan 430074,China;Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国石化华北油气分公司,河南郑州450006 [2]中国地质大学油气勘探开发理论与技术湖北省重点实验室,湖北武汉430074 [3]中国地质大学构造与油气教育部重点实验室,湖北武汉430074

出　　处：《地球科学》2025年第1期181-194,共14页Earth Science

基　　金：中国石油化工股份有限公司科技项目(No.P21026)。

摘　　要：断缝体油藏是鄂尔多斯盆地南缘彬长地区当前工作重点,具有储集类型多样和圈闭类型复杂的特点,以容积法计算地质储量的难点是合理确定有效厚度下限标准和含油面积.基于断缝体油藏的成因及储层特征,参考裂缝型油藏和致密油藏提出其地质储量计算的容积法及相关参数确定方法,并以JH17井区断缝体油藏为例说明实际操作和潜在问题.分析认为,断缝体油藏总体上为致密油藏,在断层附近可能局部具有构造油藏特征和明显油水界面.确定有效厚度下限标准可结合储集类型和局部油藏类型因素,资料有限时,裂缝发育性储层可考虑采用裂缝欠发育的次级储层的有效厚度下限标准的岩性、物性和饱和度参数.含油面积与断缝体范围和油气充注强度相关,需考虑断缝体油藏中明显油水界面和边部致密油分布情况,并兼顾断缝体的储层“甜点”特性和沿断层走向连通性强的特征.据此方法计算断缝体油藏实例的地质储量,发现其储量丰度可达43×10^(4) t/km^(2),约为研究区非断缝体油藏的3倍.Fault-controlled fracturing reservoirs have become the focused object of exploration and development in Binchang area on the southern margin of Ordos Basin,which usually show diverse reservoir types and complex trap types.Consequently,it is difficult for their geological reserves estimation by volumetric method to reasonably determine the scope of oil-bearing area and the lower limit of effective thickness.An improved volumetric method,referring to those for fractured reservoir and tight oil reservoir,was proposed for the geological reserves estimation,on the basis of the reservoir origin and its features.The ways to determine their related parameters were analyzed.Then the example of fault-controlled fracturing reservoirs from well block JH17 in Binchang area was used to demonstrate the process and some potential issues.It is believed that fault-controlled fracturing reservoirs show the features of tight oil reservoir as a whole,with the local features of structural reservoir and typical water-oil contact near fault surfaces.The lower limit of effective thickness can be determined by considering the factors of reservoir types and local oil-reservoir types.In the case of limited data,fracturing reservoirs can refer to some parameters of the lower limit for the secondary reservoirs with less fractures,such as those of lithology,porosity,permeability and saturation.The scope of oil-bearing area is related to that of fault-controlled fracturing body and the strength of hydrocarbon emplacement.Its determination should consider the distributions of the typical water-oil contact and the tight oil,as well as the"sweet spot"feature and the excellent connectivity along fault strike of fault-controlled fracturing body.According to the scheme,the geological reserves were estimated for the instance of fault-controlled fracturing reservoirs,with a reserves abundance of up to 43×10^(4) t/km^(2),about three times that of other types of reservoir in the study area.

关 键 词：断缝体油藏 地质储量 容积法 彬长地区 石油地质学 

分 类 号：P618.13[天文地球—矿床学]