蜀南地区麻柳场嘉陵江组储层测井评价方法研究
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摘要
目前,碳酸盐岩储层的测井评价依然是世界性难题,对储层的识别不准确,储层的有效性的确定不准,同时储层的流体性质的判断也时常误判断;因为碳酸岩盐裂缝性储层以其自身独特的空隙空间结构,故它的评价不同于砂岩;它具有低孔、各向异性和非均质性。本研究是由于蜀南地区麻柳场。本研究区域存在下面问题:①岩性复杂且储层纵向上多层分布。②储层特征不明显。③测井储层参数计算结果与岩心分析结果差别大。④气、水层的电阻率测井响应特征不明显。
麻柳场嘉陵江组主要划分4类亚相,潮缘滩等微相是嘉陵江组储层发育的有利沉积相带。麻柳场构造嘉陵江组岩石矿物十分复杂,主要岩石有方解石、白云石、粘土矿物、硬石膏、黄铁矿、沥青等;粘土矿物类型主要为伊利石,粘土分布于晶间孔中。根据研究,采用重叠法和交会图法建立了该研究区域的岩性和储层测井识别模式。采用无铀自然伽玛曲线计算泥质含量,渗透率的计算模型为K=0.00157xφ~(2.095);地层水电阻率Rw定为0.03左右;胶结指数m、饱和度指数n根据岩电实验确定,m值为1.67,n值1.95。产水层与气藏不为同一压力系统,圈闭范围内高部位局部产水、低部位产气,表现为局部封存水的特征。判别嘉四流体性质比较有效的方法是CNL-Rt交会法:判别嘉二嘉陵江组比较有效的方法是AC-CNL交会法。
Nowadays, the log evaluation for carbonate rock reservoir is still one of the worldwide difficult problems, which it appears to be the followings aspects: it can not identify accurately the reservoir, can not ascertain if the reservoir is available or not, and as well as the acknowledgement for the fluid property often tend to be mistakes. Meanwhile, the evaluation for carbonate fractured reservoir will be different from the sandstone due to its special void space structure which it has low porosity, nonisotropy and heterogeneity. In this paper, the research area lies in the Maliuchang area of Southern Sichuan province.
In this area, its local geology tends to be the following problems, they are-firstly, the lithology is complicated and their vertical distributions appear to the multi-layers; secondly, the reservoir property is not obvious; thirdly, there are big different between the computation results for reservoir parameters of logging and core analysis; lastly, the logging response of gas and water layer are not obvious.
The Jialing River formation is commonly divided into 4 sub-facies, among which the micro-facies such as tidal edge strands are the beneficial sedimentary facices for the Jialing River formation reservoir.
Furthermore, the rock mineral for the jailing river formation of maliuchang structure are very complicated, which compose of the calcites, limestones, hydrosialites, anhydrites, pyrites, asphalts and so on. Among them, the main clay mineral is illite and the clay distribute in the intercrystal pores.
Based on this, the application of overlay technique and crossplot technique is used to build its identification mode of lithology and reservoir logging of this area.
Applied the natural gamma curves without containing uranium to calculate shale contents, and computation mode for permeability is K=0.00157 xΦ~(2.095), the formation water resistivity(Rw) is treated as around 0.03, cementation exponent m and saturation exponent n are figure out from the experiment for lithologic and electrical property, and then the value of m is 1.67, and n is 1.95.
The water formation and gas reservoir are not the same pressure system, and the local high area within the trap scope product waters and appear to be the property of local water-sailing.
The research result demonstrated that the valid identification method for the fluid property of the 4~(th) member of Jialing River formation is the CNL-Rt crossplot technique, while for the fluid property of second member of jailing river formation is AC-CNL crossplot technique.
麻柳场嘉陵江组主要划分4类亚相,潮缘滩等微相是嘉陵江组储层发育的有利沉积相带。麻柳场构造嘉陵江组岩石矿物十分复杂,主要岩石有方解石、白云石、粘土矿物、硬石膏、黄铁矿、沥青等;粘土矿物类型主要为伊利石,粘土分布于晶间孔中。根据研究,采用重叠法和交会图法建立了该研究区域的岩性和储层测井识别模式。采用无铀自然伽玛曲线计算泥质含量,渗透率的计算模型为K=0.00157xφ~(2.095);地层水电阻率Rw定为0.03左右;胶结指数m、饱和度指数n根据岩电实验确定,m值为1.67,n值1.95。产水层与气藏不为同一压力系统,圈闭范围内高部位局部产水、低部位产气,表现为局部封存水的特征。判别嘉四流体性质比较有效的方法是CNL-Rt交会法:判别嘉二嘉陵江组比较有效的方法是AC-CNL交会法。
Nowadays, the log evaluation for carbonate rock reservoir is still one of the worldwide difficult problems, which it appears to be the followings aspects: it can not identify accurately the reservoir, can not ascertain if the reservoir is available or not, and as well as the acknowledgement for the fluid property often tend to be mistakes. Meanwhile, the evaluation for carbonate fractured reservoir will be different from the sandstone due to its special void space structure which it has low porosity, nonisotropy and heterogeneity. In this paper, the research area lies in the Maliuchang area of Southern Sichuan province.
In this area, its local geology tends to be the following problems, they are-firstly, the lithology is complicated and their vertical distributions appear to the multi-layers; secondly, the reservoir property is not obvious; thirdly, there are big different between the computation results for reservoir parameters of logging and core analysis; lastly, the logging response of gas and water layer are not obvious.
The Jialing River formation is commonly divided into 4 sub-facies, among which the micro-facies such as tidal edge strands are the beneficial sedimentary facices for the Jialing River formation reservoir.
Furthermore, the rock mineral for the jailing river formation of maliuchang structure are very complicated, which compose of the calcites, limestones, hydrosialites, anhydrites, pyrites, asphalts and so on. Among them, the main clay mineral is illite and the clay distribute in the intercrystal pores.
Based on this, the application of overlay technique and crossplot technique is used to build its identification mode of lithology and reservoir logging of this area.
Applied the natural gamma curves without containing uranium to calculate shale contents, and computation mode for permeability is K=0.00157 xΦ~(2.095), the formation water resistivity(Rw) is treated as around 0.03, cementation exponent m and saturation exponent n are figure out from the experiment for lithologic and electrical property, and then the value of m is 1.67, and n is 1.95.
The water formation and gas reservoir are not the same pressure system, and the local high area within the trap scope product waters and appear to be the property of local water-sailing.
The research result demonstrated that the valid identification method for the fluid property of the 4~(th) member of Jialing River formation is the CNL-Rt crossplot technique, while for the fluid property of second member of jailing river formation is AC-CNL crossplot technique.
引文
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