珠江口盆地文昌油田低阻油层地质成因研究

Study of Geological Causes of Low Resistivity Reservoirs of Wenchang Oilfield in the Pearl River Mouth Basin

以文昌13—1／2油田珠江组一段（ZJ-1）典型低阻油气层为例，以石油地质学和测井学作为理论基础，从岩心、薄片、莉井等资料综合分析其低阻成因特征。通过对文昌13—1／2油田粒度分析、孔隙结构、粘土和泥质含量、润湿性、导电矿物、薄互层的分析，并与文昌13—1／2油田珠江组二段高阻高渗层段分析对比。研究结果表明，文昌地区的低阻油气层成因主要受成岩作用、岩石物性、薄五层等因素的控制，它们共同作用造成了储层的高束缚水，导致所测区域电阻率值偏低．为造成该地区低阻的最主要原因。

Taking the typical low rosistivity oil and gas reservoirs of the 1st Member of Zhujiang （Pearl River） Follnation （ZJ-1） of Wenchang 13-1/2 oilfield as examples, characteristics of the causes of their low resistance arc analyzed comprehensively from the core, thin section, well logging information, on the theoretical basis of the petroleum geology and well-logging study. By analyzing the granularity, pore structure, clay and shale contents, wettability, conductive minerals, thin alternating beds of Wcnchang 13-1/2 oilfield, and comparing with the analysis of high resistivity and high permeability strata of the No.2 Member, Zhujiang Formation of Wenchang 13-1/2 oilfield, the study results show that the main causes of low resistivity reservoirs of the Wenchang area are controlled by factors of diagenesis, rock properties, and thin alternating beds. Their co-action leads to the reservoir＇s high water saturation, sequentially resulting in the measured region low value of resistivity, which is the main reason to cause the low resistivity of the region.