巨型整装孔隙-孔洞型碳酸盐岩疑难油层解析

Difficult Analyses of Pore-hole Type Carbonate Oil Reservoir in Giant Monoblock Oilfield

DZ油田X储层类型为孔隙-孔洞型,前期研究DZ油田X地层发育优质油层,但纵向上储层连续性差,其间很可能被致密层或者干层所封隔。通过测井精细解释技术研究,重点加强了储层有效下限、油水敏感性等基础性分析,明确了利用正逆累积法和累积油气体积法确定储层下限的可靠性,阐述了Pickett图版和电成像孔隙度频率分布谱是判别孔隙-孔洞型碳酸盐岩储层流体性质的最有效方法。研究成果首次在该地区得到广泛应用,成功发现了含少量铁粉的低电阻率油层、低泥质含量的高含有机质油层,进一步证明了该油藏储层纵向上分布的连续性,为DZ油田X地层220亿桶巨型油藏的成功探明提供了技术支持。

The reservoir type of X in DZ oilfield is pore-cave. There exists high-quality reservoir in X formation of DZ oilfield, but the continuity of reservoir is poor vertically and is likely to be separated by compact layer or dry layer. Through the research of well logging fine interpretation technique, the fundamental analysis of the limits of effective reservoir and oil-water sensitivity is strengthened, the reliability to determine the lower limit of the reservoir with positive and negative cumulation method and volumetric method estimating petroleum reserves is defined, and the best useful method to define the reservoir fluid properties in pore-cave formation in carbonate reservoir is Pickett chart and the frequency distribution of porosity in electrical imaging. The research has been widely used in the area, a small amount of iron-containing low resistivity oil layer and high content of organic matter oil layer with little mud have been found. It is further proved the continuity of vertical reservoir, and provides a strong technical support for ascertaining the giant reservoir of 22 billion barrel in X formation in DZ oilfield.