JZS低潜山带储集层特征及控制因素分析

The analysis of reservoir characters and controled factors in the JZS buried hills

JZS低潜山带油藏是渤海油田勘探的又一次重大发现。通过采取岩心观察、薄片鉴定、扫描电镜、测井综合评价、应力场分析等岩性及裂缝研究方法指出JZS太古界潜山带储层为一套结晶岩，以斜长片麻岩、二长片麻岩为主，储集空间包括裂缝和溶蚀孔隙，裂缝在整套潜山储层中相当发育，其中构造高角度缝占主导地位，裂缝发育优势方位为北东～南西向、北北西～南南东向。储层发育受到岩性、构造运动、古风化溶蚀作用、充填物的影响。潜山储层的分布具有纵向分带，横向分区的特点，纵向上分为4个亚带，油气富存在前两个亚带，有效储层厚度为不整合面以下平均150-200m，风化壳顶0～5m，不作为主要产能区。

JZS low buried hills reservoir is another great discovery in bohai oil field. By making up use of observing cores, thin-section analysis, electronic scanning and logging comprehensive evaiuation, analysis of stress field and other methods , we know the crystalling rocks is main plagioclase gneiss and feldspar gneiss with developed fractures and pores. The reservoir space include solution cavities and pores, diversiform fractures . Fractures are dominant run through entire reservoir, among them structural high angle fractures is main section ,the fractures＇ dominant direction is NE-NW and NNW-NNE. The reservoir development is influenced by factors of lithology, structure, filling matter, and archaic solution and weathering action. Buried hills reservoir distribution characteristics is zonal both vertically and horizontal, vertically there are four zone , the hydrocarbon accumulated in former two zones, the valuable thickness of reservoir is in the range of 150 meters to 180 meters below weathering crust, below weatherz ing crust 0-5m is not main production zone.