宜川-黄龙地区低丰度气藏成因探讨  

Discussion on the causes of low abundance gas reservoir in Yichuan-Huanglong area

作　　者：陈朝兵[1,2] 冯炎松[3] 汪淑洁[3] 胡薇薇[3] 朱玉双[1] 王超[2] 陈江萌[2] 叶葱林[2] CHEN Zhaobing FENG Yansong WANG Shujie HU Weiwei ZHU Yushuang WANG Chao CHEN Jiangmeng YE Conglin(State Key Laboratory of Continental Dynamies, Northwest University, Xi＇an 710069, China Research Instituie of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi＇an 710021 No. 2 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi＇an 710200, China)

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069 [2]中国石油天然气股份有限公司长庆油田分公司第二采气厂,陕西西安710200 [3]中国石油天然气股份有限公司勘探开发研究院,陕西西安710021

出　　处：《西北大学学报（自然科学版）》2017年第3期422-430,共9页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技重大专题“复杂天然气藏开发关键技术”基金资助项目(2016zx05015-001)

摘　　要：从"生、储、盖、圈、运、保"6大油气成藏要素出发,结合地震、测井、试气、生产曲线等动静态分析,探讨宜川—黄龙地区低丰度气藏的成因。结果表明,该区低丰度气藏主要受"储、保"两大因素控制。研究区储层整体致密,孔渗相关性差,有效储集空间有限,导致原始气藏含气饱和度偏低,是低丰度气藏形成的内因。致密砂岩储层形成的岩性-物性圈闭能有效降低或隔绝后期裂缝带对气藏的破坏,对残余气藏的保存具有一定积极意义。地震、岩心及成像测井等资料表明,该区断裂及裂缝普遍发育,是低丰度气藏最终形成的主控因素。构造运动对原始气藏的影响具有两面性:一方面,早期断裂带将储层孔隙改造为双孔介质,在一定程度上改善了储层物性;另一方面,构造运动形成的断裂破坏了原始气藏的保存条件,天然气发生逸散并重新分布。同时,外围地层水涌入裂缝带及周围储层,形成地层水富集区,造成气井普遍产水。从目前完钻井的试气效果来看,试气效果与断裂发育程度相关,距离裂缝边界越远,试气产量越高,产水现象越少。因此,钻遇储层中部且距裂缝边界较远是研究区获得工业产能的前提条件。From the six elements of hydrocarbon accumulation, source, reservoir, cover, traps, migration and preservation, combined with static and dynamic analysis of seismic, logging, gas testing and production curve to explore the causes of low abundance gas reservoir in Yichuan-Huanglong area. The results demonstrated that there are two influencing factors, ＂reservoir and preservation＂, which result in the low abundance gas of the reservoir in this area. The ＂reservoir＂ is tight reservoirs. Tight reservoirs in the study area have a poor correlation between porosity and permeability, and limited effective reservoir space, causing the gas saturation of the original gas reservoir is low, which is the internal reason of gas reservoir formation of low abundance. The lithology-properties traps formed by tight sandstone reservoir can effectively reduce or isolate the breaking due to the destruction of the band of post-fracture, which has a positive meaning for conservation of residual gas reser-oir. ＂Preservation＂, that is storage conditions suffered from the destruction of tectonic movement. Seismic, core and imaging logging data, which indicated that the fracture and crack are well developed, are the dominating factors of low abundance and ultimately formation of gas reservoir. There are two different typies of effect from tectonic movement to the original gas reservoir. On one hand, early fault has turned porosity of reservoir into double porosity, improved the properties of reservoir in some way. On the other hand, the faults formed from tectonic movement destroyed the condition of storage of original gas reservoir, causing the escape and redistribution of gas, pushing formation water of peripheral zone into the cracks and the surrounding reservoir, formating the water-rich region, leading wells which producing water widespread. From the results of gas testing currently, results of gas testing associated with the degree of development of fracture. The longer distance from the border of fracture, the better resu

关 键 词：宜川-黄龙地区 低丰度气藏 油气成藏要素 烃源岩 油气运移 断层 

分 类 号：TE122.1[石油与天然气工程—油气勘探]