火山岩地震解释技术在松辽盆地长岭断陷深层天然气勘探中的应用
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摘要
松辽盆地长岭断陷火山岩具有目标描述难,储层非均质性强、储层评价难,含气范围预测难的特点。本文以长岭断陷深层营城组火山岩储层为研究目标,应用火山岩地质理论,利用重磁电震勘探成果对营城组火山岩进行了精细研究,得出以下认识:①火山岩表现为高磁力异常,中酸性火山岩同时还表现为低重力异常,因此利用重磁资料能有效地确定火山岩的分布范围,但利用重磁资料预测火山岩具有局限性,需要利用高精度的三维地震资料进行火山岩精细研究。②火山岩岩相地震特征分析表明,火山岩的主体外形呈丘状。火山岩地震相的低瞬时频率属性通常反映近火山口爆发相—溢流相火山岩分布,强反射振幅属性通常反映离火山口较远的薄层溢流相及火山沉积相火山岩分布。③工区中酸性火山岩储层物性明显好于中基性火山岩,且火山岩储集体的好坏与纵波波阻抗具有很好的相关性,即储集物性越好,其纵波波阻抗越小。④测井分析表明,当入射角度达到25°以上时,声波阻抗和弹性波阻抗差异明显,利用这种差异有助于区分和识别油气藏。文中还通过叠前反演技术预测了哈尔金火山岩体的两个有利含气区块。
The volcanic rock in Changling fault depression of Songliao basin is characterized by difficulty to describe target,strong inhomogeneous reservoir,difficulty to evaluate the reservoir and to predict the gas-bearing range.Taking the volcanite reservoir of Yingcheng Formation in deep of Changling fault depression as studied target,and applying vulcanite geologic theory and results by gravity,magnetic,electric and seismic exploration to carry out fine study on Yingcheng Formation volcanic rock,the following knowledge is gotten: ①the volcanic rock is characteristic of high magnetic anomaly,mid-acid volcanic rock has also the character of low gravity anomaly,so the gravity and magnetic data can effectively define the distribution range of volcanic rock,but has some limitation,it should carry out fine study of volcanic rock in combining with high-precision 3-D seismic data;②the analysis on seismic feature of vulcanite facies showed the appearance of main body of volcanic rock is hummocky,the low instantaneous frequency attribute of seismic facies of volcanic rock often reflects the distribution of explosive facies-effusive facies vulcanite near volcanic vent,the strong reflection amplitude attribute often reflects the distribution of thin-layer effusive facies far from volcanic vent and volcanic sedimentary facies vulcanite;③the physical property of reservoir of mid-acid vulcanite is better than that of mid-basic vulcanite in the work area,and good or bad vulcanite reservoir had good correlation to P-wave impedance: the better the reserve physical property,the smaller the P-wave impedance;④the logging analysis showed when incident angle reaches to 25° and above,the difference between sonic impedance and elastic impedance is significant,using this difference is helpful to differentiate and identify the reservoir.The paper predicted two benefit gas-bearing blocks in Halkin volcanic rock by prestack inversion technique.
The volcanic rock in Changling fault depression of Songliao basin is characterized by difficulty to describe target,strong inhomogeneous reservoir,difficulty to evaluate the reservoir and to predict the gas-bearing range.Taking the volcanite reservoir of Yingcheng Formation in deep of Changling fault depression as studied target,and applying vulcanite geologic theory and results by gravity,magnetic,electric and seismic exploration to carry out fine study on Yingcheng Formation volcanic rock,the following knowledge is gotten: ①the volcanic rock is characteristic of high magnetic anomaly,mid-acid volcanic rock has also the character of low gravity anomaly,so the gravity and magnetic data can effectively define the distribution range of volcanic rock,but has some limitation,it should carry out fine study of volcanic rock in combining with high-precision 3-D seismic data;②the analysis on seismic feature of vulcanite facies showed the appearance of main body of volcanic rock is hummocky,the low instantaneous frequency attribute of seismic facies of volcanic rock often reflects the distribution of explosive facies-effusive facies vulcanite near volcanic vent,the strong reflection amplitude attribute often reflects the distribution of thin-layer effusive facies far from volcanic vent and volcanic sedimentary facies vulcanite;③the physical property of reservoir of mid-acid vulcanite is better than that of mid-basic vulcanite in the work area,and good or bad vulcanite reservoir had good correlation to P-wave impedance: the better the reserve physical property,the smaller the P-wave impedance;④the logging analysis showed when incident angle reaches to 25° and above,the difference between sonic impedance and elastic impedance is significant,using this difference is helpful to differentiate and identify the reservoir.The paper predicted two benefit gas-bearing blocks in Halkin volcanic rock by prestack inversion technique.
引文
[1]李石,王彤.火山岩.北京:地质出版社,1980,20~40
[2]赵海玲.火山岩储层.现代地质,1998,12(1):62
[3]唐建仁等.松辽盆地北部徐家围子断陷火成岩分布及成藏规律.石油地球物理勘探,2001,36(3):346~349
[4]蔡先华.松辽盆地南部长岭断陷的火山岩分布及成藏规律.石油地球物理勘探,2002,37(3):291~294
[5]毛小平等.厚层火山岩地震响应研究.石油地球物理勘探,2005,40(6):670~676
[6]陈海云等.济阳拗陷新生代火山岩的识别.石油地球物理勘探,2005,40(6):663~669
[2]赵海玲.火山岩储层.现代地质,1998,12(1):62
[3]唐建仁等.松辽盆地北部徐家围子断陷火成岩分布及成藏规律.石油地球物理勘探,2001,36(3):346~349
[4]蔡先华.松辽盆地南部长岭断陷的火山岩分布及成藏规律.石油地球物理勘探,2002,37(3):291~294
[5]毛小平等.厚层火山岩地震响应研究.石油地球物理勘探,2005,40(6):670~676
[6]陈海云等.济阳拗陷新生代火山岩的识别.石油地球物理勘探,2005,40(6):663~669
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