普光气田碳酸盐岩储层裂缝的成因及其控制因素  

Genesis and Control Factors of Fractures in Carbonate Reservoirs in Puguang Gas Field

作　　者：何胡军[1,2] 曾大乾[2] 毕建霞[2] 王秋语[1] 

机构地区：[1]中国石油冀东油田分公司 [2]中国石化中原油田分公司

出　　处：《海相油气地质》2014年第4期65-72,共8页Marine Origin Petroleum Geology

摘　　要：普光气田为一边水、高含硫、多裂缝的碳酸盐岩气藏。为防止边水通过裂缝网络进入储层,造成水淹,对裂缝进行了成因机制和控制因素的系统研究。普光气田长兴组和飞仙关组碳酸盐岩储层自沉积以来主要经历了三个不同力源方向的构造挤压运动,形成了一系列与地层变形和断层相关的剪切缝和扩张缝。认为裂缝的发育程度主要受控于构造运动,地层变形越强,裂缝越发育;与断层相关的裂缝系统主要发育在距断层1 200 m的范围内,离断层越近,裂缝越发育。裂缝发育程度还受岩性、岩层厚度、岩石结构组分、储集物性等因素的综合影响。岩性不同,裂缝发育程度不同;裂缝发育密度随岩层厚度、粒屑含量的增加而减小,随填隙物、基质含量的增加而增大。裂缝主要发育在孔隙度较差的储层中,储层孔隙度较好时,裂缝相对不发育。Puguang Gas Field is composed of the Changxing（P3） and Feixianguan（T1） carbonate reservoirs with abundant fractures, edge water and high content of sulfur in gas. To prevent edge water from entering reservoirs along fracture nets to floods, it is important to know the genesis and control factors of fractures in these reservoirs. A series of shearing and extending fractures that are relative to strata deformation and faulting have developed because of different force-source tectonic compressions from three directions since Changxing and Feixianguan reservoirs deposited in this field. It is deemed that the development of fractures was controlled by tectonism, the more intensive strata deformation is, the more fractures develop. Fracture system related with faults mostly distributes within about 1200m distance from faults, the closer distance from faults is, the more fractures develop. In addition, development of fractures is also controlled by lithology, strata thickness, rock constituents, and physical property of reservoirs. Different lithology results in different extent of development of fractures. Density of fractures decreases with increasing strata thickness and clast content but increases with increasing interstitial material and matrix content. According to classification of reservoirs, it is realized that fractures develop commonly in the reservoir rocks with low porosity and fractures do not develop usually in the reservoir rocks with high porosity.

关 键 词：碳酸盐岩储层 储层裂缝 裂缝成因 控制因素 普光气田 

分 类 号：TE122.23[石油与天然气工程—油气勘探]