海洋天然气水合物储层特性及其资源量评价方法  

Characteristics of marine gas hydrate reservoir and its resource evaluation methods

作　　者：刘昌岭[1,2] 孙运宝 LIU Changling;SUN Yunbao(Key Laboratory of Gas Hydrate of Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266237,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China)

机构地区：[1]自然资源部天然气水合物重点实验室,中国地质调查局青岛海洋地质研究所,青岛266237 [2]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266237

出　　处：《海洋地质与第四纪地质》2021年第5期44-57,共14页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金“南海沉积物中水合物降压分解动力学行为及控制机理研究”(41876051);山东省泰山学者特聘专家计划(ts201712079);国家重点研发计划政府间国际科技创新合作重点专项“天然气水合物开采过程中井周储层动态响应行为与控制”(2018YFE0126400);国家重点研发计划“冷泉系统发育的地质条件及控制作用”(2018YFC0310001);中国地质调查局海洋地质调查专项项目(DD20190819)。

摘　　要：天然气水合物资源开发的前提条件是准确评价其资源量,而正确理解天然气水合物储层特性是准确评价其资源量的基础。天然气水合物的含量及其赋存形态是影响储层特性的主要因素,赋存形态主要受海洋沉积物的储集的性质与大小控制。储层特征参数直接影响海洋天然气水合物资源评价的准确性。现有天然气水合物资源量评价方法的原理、评价参数及适用性各不相同,且均未考虑水合物的赋存类型。本文在前期工作的基础上,针对天然气水合物有利区块和矿体评价,分别提出了海洋天然气水合物"资源详评"与"资源精评"的新方法。基于小面元的资源详评方法,适用于钻井稀少、地球物理测网较为密集的有利区块孔隙填充型水合物控制地质储量评价;基于"水合物地层丰度"概念的资源精评方法,适用于井网密集的井场小范围矿体探明地质储量精准评价,可有效提高对块状、脉状和结核状等裂隙型填充型水合物资源评价的准确度。To accurately make resource evaluation is the prerequisite for development of natural gas hydrate resources, and the correct understanding of the characteristics of gas hydrate reservoir is the basis for such evaluation. The content and occurrence of gas hydrate are closely related to and affected by reservoir properties. The occurrence forms of gas hydrate, which includes pore-filling and fracture-filling,mainly depends on the nature and size of pores, fractures and other accumulation spaces in the marine sediments. Different types of hydrate reservoirs have different physical property response characteristics, which directly affects the accuracy of marine gas hydrate resource evaluation. The principles, evaluation parameters and applicability of the existing natural gas hydrate resource evaluation methods are different,and the occurrence type of hydrate is not considered. Based on the previous work, this paper puts forward a new method of "Detail Resource Evaluation" and "Precise Resource Evaluation" for marine natural gas hydrates. The "Detail Resource Evaluation" method based on small panel is suitable for the evaluation of pore-filled hydrate reservoir with rare drilling and dense geophysical survey network in favorable block;The "Precise Resource Evaluation" method based on the concept of "hydrate abundance in reservoir" is applicable to the accurate evaluation of small-scale hydrate orebody with dense well pattern in the well field, and can effectively improve the accuracy of the evaluation of fracturefilled types(e.g. massive, vein and nodule) hydrate resources.

关 键 词：海洋天然气水合物 赋存形态 储层特性 基础物性 资源评价方法 资源量 

分 类 号：P744[天文地球—海洋科学]