吉林红岗北致密油特征、成因及开采技术

CHARACTERISTICS,CAUSES AND PRODUCING TECHNOLOGIES FOR THE TIGHT OIL IN NORTH HONGGANG OF JILIN

吉林红岗北致密油经过多项常规开发试验,效果不明显.综合运用室内实验和试油资料描述致密油特征,分析成因,结合国内致密油开发现状,确定主体开发技术.研究表明：红岗北致密油储集体以薄互层为主,单层厚度小,多层叠合连片,主力层单一;储层物性极差,喉道微小（小于1μm）,孔喉连通关系复杂,发育有微裂缝;原油性质好,可动流体饱和度低,属于特低储量丰度储层.黏土矿物含量偏高和低成熟度的砂体在强烈压实和胶结作用下造成砂岩储集层致密化.流体充注窗口期与储层致密化发生时空重合,储层为油水同层.长水平井多段压裂技术可以实现致密油的有效开发.

Many conventional developing tests are conducted for the tight oil in North Honggang of Jilin, their effects are not obvious. Through integrating the data of indoor experiments and well test, the characteristics are de- scribed, and the causes are analyzed. In the end, by means of the combination of the current development statuses of the tight oil at home and abroad, the major producing technologies are determined. The studies show that the tight oil reservoirs take thin interbeds as the main forms and moreover are characterized by thin individual layer, o- verlapped so many layers in a larger scale, single principal oil reservoir, extremly poorer body physical properties, micro-throat （less than 1 μm } , complex connectivity relation among the pores and throats, well-developed micro- fractures ; the properties of the crude oil are much better, the saturations of the mobile fluids are rather lower--the features of extra-low reserves abundance reservoirs. The content of the clay minerals is a little bit higher, the low- maturity sand bodies under the actions of strong compaction and cementation result in the densification of the sand reservoirs. The time and spacial coincidences happened for the window of fluid charge and densification of the res- ervoirs, the reservoirs belong to oil and water co-existence ones. Multi-interval fracturing technology for the longhorizontal well can realize the aim of the effective development of the tight oil.