珠江口盆地低阻油层测井综合识别方法研究

The Logging Tegrated Recognition for Low Resistivity Reservoir in Pearl River Mouth Basin

文昌油田存在大量的低阻油层,储层泥质含量较重,物性较差,岩石颗粒细,束缚水含量高,电阻率较围岩无明显异常,导致在低阻油层识别方面遇到很大的困难;文昌A油田的2井区已经测试证实为油层,但与其相邻的1井区既无测试也无生产资料,为有效确定其流体性质,在分析低阻油层测井响应的基础上,一方面,引进了电阻率重叠法、神经网络法、流体指标法、三水模型等方法,并参考地层岩性、含油性与气测显示等信息,来建立定性识别低阻油层的判别标准;另一方面,通过对比两个井区储层的四性关系特征,采用类比的方法,来进一步证实1井区储层的含油性,解释结果后经地层测试的证实,表明测井综合解释的结果是可靠的。

Wenchang oil field contains a large number of low Resistivity Reservoir, it has a High content of shale content and bound water, low porosity and its rock particle is very fine, and No abnormal were observed for resistivity compared with it's wall rock, so it is difficult to identify low resistivity reservoir effectively, After formation testing , it can approve that oil do exist in 2 well area in wenchang A field, but for 1 well area which adjacent to 2 well area, there is no testing and production information, in order to determine the fluid properties, based on the log response of low Resistivity oil layer , on the one hand, The paper introduced several methods which include resistivity overlay technique、Neural Networ、fluid indicators、three-water model and so on, and refer to some useful information such as the lithology of the formation、oil-bearing and mud logging indication, in order to build the qualitative identification standard for low resistivity reservoir. On the other hand, By comparing four-property relationship of low resistivity reservoir between the 1 and 2 well area in wenchang A field, using the method of analogy, we try to prove that there is also contains low resistivity reservoir in 1 well area, the conclusion is approved by formation testing, the result shows that logging integrated interpretation is reliable.