Study And Application Of Seismic Multi-Attribute Detection Technique On Gas Reservoirs

Based on studying the factors that affect seismic attributes of gas reservoirs in the paper combining the with such information achievements as practical data, well-logging, drilling, computer, cmalytical data,etc., a kind of capable methed detecting gas reservoirs is illustrated sysmatically through seismic muliti-attirbutes. Applying new methods & techniques. Not only the paper involved several main gas-bearing fields in China, for example, Sichuan, Orders, Tedium, many research aspects were included. Several creative & practical achievements have been got. The technique has played an important rule in gas exploration through applying it in Cochran & Orders Basin. Chief research results are the following 7 aspects:1.Seismic attributes were divvied into several types and main seismic attributes & factors were analyzed systematically.2. AVO method was applied in studying Upper Paleozoic gas-bearing sandstone in Yule Area of orders Basin. The sandstone belonged the and types that is, a gas-bearing sandstone with almost zero impedance and decreasing amplitude with increasing affect in gas reservoirs.3.Gas reservoir of Baimamiao Area in western Sichuan is controlled by structure lithology with strong anisotropism. Based on analyzing its geophysical chatters deeply, a set of integrated method detecting gas reservoir was founded among impedance inversion as key techniques applying such various information as geology, well-logging, drilling, well-testing, analytical data, and so on. Among suggested 10 well location, drill succeed is wore them 80 percent.4.Nine quaternary gas reservoirs were forecasted in 1st Sebei gas field of Chaidamu basin through impedance inversion technique combining with the analysis of AVO & multi-attribute. Every boundary Scope of gas reservoirs was determined, but also gas reserve was forecast. Moreover. 3 gas prospective targets were put forward in 1st, 2nd & 3rd Seibu gas field.5. Gas reservoir detection technique must be bossed on geophysical characters. The key is choosing method, that is, different circumstance should use different methods & techniques because seismic data has multiple answers.6. At present, seismic methods detecting gas reservoirs can mainly be classified into 3 types-AVO. Impedance Inversion & Attributes Inversion according to utilizing and development. The base and method predicting gas reservoir are collection & analysis technique of gas reservoir attributes and AVO Seismic Inversion.7. Mostly Impedance Inversion is one of the most effective methods. Generally gas reservoir has an apparent character of low velocity & low frequency in the inversion profile.