基于等效介质模型和频变AVO反演的裂缝储层参数估算方法     

李博南  刘财  郭智奇 《吉林大学学报(地球科学版)》2017,47(1)

由于裂缝性油气藏具有突出的资源潜力和经济效益,利用地震方法对裂缝储层进行精细的定量描述逐渐成为勘探地球物理的关键任务之一。为了克服以往数据驱动类反演方法无法直接获得裂缝参数、而基于静态等效介质模型驱动的反演方法无法描述孔隙内部结构和流体信息的缺点,笔者提出一种基于动态等效介质模型的储层定量描述新方法。该方法通过频变AVO(amplitude variation with offset)理论建立目标函数并使用全局最优化算法反演裂缝参数。一维和二维模型测试证实,由于充分利用了反射系数频变响应对裂缝密度和时间尺度因子的敏感性,反演方法可以对裂缝储层实现有效描述。  相似文献   

Elastic-wave velocity characterization of gas hydrate-bearing fractured reservoirs in a permafrost area of the Qilian Mountain,Northwest China     

《Marine and Petroleum Geology》2017

There are two types of gas hydrate-bearing reservoirs in the permafrost area of Qilian Mountain. Most of the gas hydrates occur mainly in the fractured mudstone reservoirs and rarely in the pores of the sandstone reservoirs. In this study, for the acoustic velocity characterization of the fractured gas hydrate reservoirs of the Qilian Mountain permafrost area, some mudstone core samples were collected for physical rock experiments, such as the acoustic experiment and the porosity and permeability experiment. An acoustic velocity numerical simulation of gas hydrate reservoirs was performed according to the Biot theory and the differential effective medium theory, with the conditions of multiple gas hydrate occurrence models, including the suspension model, the semi-cementation model and the cementation model, and considering both infinite and penny-shaped cracks. Fracture porosity was added to the core samples that only contain matrix porosity. With fracture porosity ranging from 0.01% to 5%, the variation laws between acoustic velocity with fractured porosity and hydrate saturation are obtained: (1) In the case of an infinite crack, if the fractured porosity is 0.01%–1%, the P-wave velocity decreases rapidly in the case of the three occurrence models. If the fractured porosity is higher than 1%, the acoustic velocity decreases gradually. If the crack shape is a penny-shaped crack, the P-wave velocity decreases almost linearly with increasing fracture porosity. (2) If the hydrate occurrence model is the suspension model, the P-wave velocity increases slightly with increasing hydrate saturation. If the occurrence model is the semi-cementation model or the cementation model, when the gas hydrate saturation of the infinite crack ranges from 0 to 80%, the acoustic velocity increases approximately linearly, whereas when the gas hydrate saturation ranges from 80% to 100%, the velocity increases rapidly. If the crack is a penny-shaped crack, the velocity increases almost linearly with increasing gas hydrate saturation from 0 to 100%. (3) It is found that the fractured gas hydrate reservoirs of the Qilian Mountain permafrost area contain both penny-shaped and infinite cracks, of which the infinite crack is the main crack shape. The gas hydrate occurrence in the Qilian Mountain permafrost area mainly follows the suspension model. This has significance for the seismic exploration and log evaluation of gas hydrate-bearing fractured reservoirs in the permafrost area of the Qilian Mountain in studying the acoustic velocity characterization, the crack shapes and occurrence models of gas hydrate reservoirs in the study area.  相似文献   

Integrated core-log facies analysis and depositional model of the gas hydrate-bearing sediments in the northeastern continental slope,South China Sea     

《Marine and Petroleum Geology》2017

Host sediments may exert a significant influence on the formation of gas hydrate reservoirs. However, this issue has been largely neglected in the literature. In this study, we investigated the types, characteristics and the depositional model of the fine-grained gas hydrate-bearing sediments in the northeastern margin of the South China Sea by integrating core visual observations and logging-while-drilling downhole logs. The gas hydrate-bearing sediments consist dominantly of muddy sediments formed in the inter-canyon ridges of the upper continental slope, including hemipelagites, debrites (mud with breccia) and fine-grained turbidites. Cold-seep carbonates and associated slumping talus, muddy breccia debrites, as well as coarse-grained turbidites, may locally occur. Four classes and six sub-classes of log facies were defined by cluster analysis. Core-log correlation indicates that gas hydrates are majorly distributed in fine-grained sediments with high resistivity and low acoustic transit time (AC) log responses, which are easily differentiated from the fine-grained background sediments of high gamma-ray (GR), high AC, and low resistivity log values, and the seep carbonates characterized by low GR, high resistivity, high density, low AC and low porosity log values. The primary host sediments consist of fine-grained hemipelagic sediments formed by deposition from the nepheloid layers of river material and from the microfossils in seawater column. Most of the hemipelagic sediments, however, might have been extensively modified by slumping and associated gravity flow processes and were re-deposited in the forms of debrites and turbidites. Locally developed seep carbonates associated with gas hydrate dissociation and leakage provided additional sources for the gravity flow sediments.  相似文献   

致密储层研究进展和热点问题分析     

朱筱敏  潘荣  朱世发  魏巍  叶蕾 《地学前缘》2018,25(2):141-146

全球常规油气及非常规油气资源极为丰富,其中致密油气是非常规油气资源的主要类型,是当前非常规油气勘探的重点,也是未来接替常规油气资源的重要领域。致密储层具有油气资源量大、分布面积广、成岩作用强、单井产量较低、储层非均质性强等特点。在富含油气资源的致密储层中,具有良好物性的“甜点”是提高产量的有利勘探目标,其“甜点”主要包括两类,一类为异常高孔带,另一类为裂缝发育带。目前,致密储层的研究现状主要包括致密储层划分、地质特征、形成机理和有利储层预测等。近年来,“甜点”的形成机理和预测成为当前致密储层勘探开发的重要科学问题。因此,致密储层微观孔喉结构表征、致密储层裂缝发育识别表征是目前致密储层研究的热点领域及未来主要发展方向。  相似文献   

非常规综合物化探方法寻找油气藏基础理论研究中的几个问题   总被引：1，自引：1，他引：0  

刘庆生  廖乔奇  曲赞  程同锦  夏响华 《地球科学》1999,(6)

评述了非常规综合物化探方法寻找油气藏领域的研究现状 .认为多年来这一领域中以应用为主的生产性科学研究项目过多强调短期行为 ,缺乏深入、系统与综合的基础理论研究 ,给方法技术的应用带来了较大的盲目性 ,制约了这一领域科学研究的发展及应用 .指出应该开展这一领域多学科的、综合的及系统的基础理论研究 .目前这一领域中值得深入研究的几个主要问题是 :油气地球化学场与地球物理场的形成机理、与烃类蚀变作用相关的岩石学与矿物学分析及与油气运移相关的岩石物理学研究等  相似文献   

Lu-Hf同位素体系对若干基础地质问题的新制约(之二)--大洋地幔端元   总被引：2，自引：0，他引：2  

程建萍  凌文黎 《地质科技情报》1999,18(2):80-84

报道了Ｌｕ－Ｈｆ同位素体系在地幔端元的地球化学研究中的部分最新应用成果。大量的大洋玄武岩Ｌｕ－Ｈｆ同位素研究表明：具亏损地幔端元（ＤＭＭ）来源的洋中脊玄武岩岩浆部分熔融的初熔区位于石留石稳定场深度,即深度为８０￣９０ｋｍ的石榴石二辉橄榄岩地幔,而不是原来所认为的尖晶石二辉橄榄岩区（深度小于６０ｋｍ）;以高放射成因Ｐｂ为特征的主Ｕ地幔端元（ＨＩＭＵ）应代表了下地幔物质在某一特定时期发生分异作用的结果  相似文献   

吉林省湖、库水质评估及其污染防治   总被引：4，自引：0，他引：4  

王俊  姜建祥  吕耀坤  王宁 《湖泊科学》1996,8(1):75-80

湖、库富营养化是营养物质输入过程而引起的一种水效应。它不仅表现为水生植物和藻类的过度生长,同时还伴随着一系列的水质变化进而导致水质恶化,影响水体多种功能。本文以近年监测的主要湖、库的水质数据,采用主成分聚类分析和营养度评价方法对吉林省的主要湖、库的富营养化程度进行了分析与评价。这对区域水资源的合理开发利用,开展环境质量评价与预测,以及对制定湖、库富营养化防治对策具有重要意义。  相似文献   

Multi-objective and multi-scheme research on water and sediment regulation potential of reservoirs in the upper Yellow River     

Tao Bai  Jia Yu  Wenting Jin  Jiaquan Wan  Shaojie Gou  Xu Ma  Panpan Ma 《国际泥沙研究》2023,38(2):203-215

The problems of the deteriorating relation between water and sediment, and the escalating conflict between water supply and demand in the upper Yellow River(YR), need to be addressed. Reservoirs of Longyangxia, Liujiaxia, and Heishanxia(Long-Liu-Hei) in the upper YR are taken as the research object, and a multi-objective, water-sediment optimal operation model for cascade reservoirs Long-Liu-Hei has been developed. This operation model considers the comprehensive requirements of water supply, po...  相似文献   

SWAT/GMS联合模型在华北平原地下水库研究中的应用   总被引：6，自引：0，他引：6  

王宏  娄华君  田廷山  朱远峰 《世界地质》2005,24(4):368-372

应用SWAT／GMS联合模型对华北平原地下水系统进行联合模拟调参,根据最后调整的平均给水度值0．165,结合研究区2000年地下水位降落漏斗的空间位置,计算出华北平原山前浅层区地下调蓄库容是5．2～6．5亿m^3。得出在华北平原启用地下水库及修建人工漏水水库、生态河等必要的配套设施,具有一定的生态价值。  相似文献   

基于岩石物理模型的碳酸盐岩储层微观孔隙特征分析方法     

李博南  曲寿利  沈珲 《吉林大学学报(地球科学版)》2020,50(1):285-293

碳酸盐岩储层的微观孔隙结构普遍具有类型复杂和纵向变化快的特征。由于地球物理资料尺度的限制,现有的解释手段不能有效刻画这些关键特征。笔者采用临界孔隙度模型作为理论依据,建立了微观孔隙结构与宏观弹性参数响应之间的定量关系;以岩石物理实验数据为约束,提出了一种基于概率统计学的方法估算储层关键参数并识别岩石孔隙类型。在YS1井的应用表明：新方法有效挖掘了声波测井数据中隐含的微观信息,参数预测结果达到较高的精度（平均相对误差小于10%）,可以为优质储层段的划分提供可靠的参考依据。  相似文献