In recent years,significant breakthroughs have been achieved in the exploration of deep volcanic rocks in the Junggar Basin,highlighting their substantial exploration potential.The complex distribution of volcanic res...In recent years,significant breakthroughs have been achieved in the exploration of deep volcanic rocks in the Junggar Basin,highlighting their substantial exploration potential.The complex distribution of volcanic reservoirs is attributed to the multi-phase tectonic evolution within the basin,with their superior reservoir properties playing a crucial role in natural gas formation.However,due to the combined effects of multi-cyclic volcanic eruptions and tectonic activities,predicting volcanic facies distribution and favorable reservoirs remains highly challenging.This study focuses on the third member of the Jiamuhe Formation in the Zhongguai Uplift.By integrating drilling and petrophysical data with well-seismic analysis techniques,a seismic identification model for volcanic reservoirs has been established.The findings reveal that different facies exhibit distinct seismic response characteristics.Andesite,rhyolite,volcanic breccia,and volcanic clastic rocks show variability in amplitude,frequency,and continuity.Using structural-guided filtering,high-resolution coherence analysis,and 3D body carving techniques,the locations of volcanic craters and eruption centers were successfully identified,further clarifying the distribution patterns of volcanic facies.By combining multi-attribute clustering analysis and seismic attribute extraction,a volcanic facies zone distribution map was generated,and favorable exploration directions for volcanic reservoirs were proposed.The study provides technical guidance for the exploration of deep volcanic oil and gas reservoirs in the Junggar Basin and holds significant application value.展开更多
To investigate the fracture initiation and propagation behavior of fractures in tight sandstone under the supercritical CO_(2)(SCCO_(2))shock fracturing,laboratory fracturing experiments were conducted using a true-tr...To investigate the fracture initiation and propagation behavior of fractures in tight sandstone under the supercritical CO_(2)(SCCO_(2))shock fracturing,laboratory fracturing experiments were conducted using a true-triaxial-like SCCO_(2)shock fracturing system.Computed tomography(CT)scanning and three-dimensional fracture reconstruction were employed to elucidate the effects of shock pressure,pore pressure,and in-situ stress on fracture characteristics.In addition,nuclear magnetic resonance(NMR)transverse relaxation time spectra were used to assess the internal damage induced by SCCO_(2)shock fracturing.The results indicate that,compared with conventional hydraulic fracturing and SCCO_(2)quasi-static fracturing,SCCO_(2)shock fracturing facilitates multidirectional fracture initiation and the formation of complex fracture networks.Increasing shock pressure more readily activates bedding-plane weaknesses,with main and subsidiary fractures interweaving into a dense fracture network.Under the same impulse intensity,elevated pore pressure reduces the effective normal stress and alters stress-wave scattering paths,thereby inducing more branch fractures and enhancing fracture complexity.An increase in differential in-situ stress promotes fracture propagation along the direction of the maximum principal stress,reduces branching,and simplifies fracture morphology.With increasing SCCO_(2)shock pressure,pore volume and connectivity generally increase:small-to-medium pores primarily respond through increased number and enhanced connectivity;when the shock pressure rises to 40-45 MPa,crack coalescence generates larger pores and fissures,which play a dominant role in improving flow pathways and effective storage space,ultimately forming a multiscale pore-fracture network.展开更多
随着全球工业化进程加快,大量二氧化碳被快速地排放到大气中,产生诸多环境问题。CO_(2)作为一种重要的碳资源,通过加氢制备高附加值化学品近年来逐渐受到研究人员广泛关注。芳烃作为一种基本化工原料,传统上主要靠石油裂解和石脑油重整...随着全球工业化进程加快,大量二氧化碳被快速地排放到大气中,产生诸多环境问题。CO_(2)作为一种重要的碳资源,通过加氢制备高附加值化学品近年来逐渐受到研究人员广泛关注。芳烃作为一种基本化工原料,传统上主要靠石油裂解和石脑油重整来生产,通过CO_(2)加氢制备芳烃可以有效减缓对化石能源的过度依赖。但是CO_(2)的惰性强、活化能垒高、C–C偶联精准调控难,使低温CO_(2)加氢制备芳烃的高效催化剂开发存在巨大挑战。目前,采用氧化物–分子筛复合催化剂体系可以将CO_(2)加氢合成甲醇与甲醇制芳烃反应进行耦合,实现CO_(2)加氢直接合成芳烃。本文通过共沉淀法制备了ZnZrO_(x)复合氧化物,并采用等体积浸渍法引入不同过渡金属(Fe、Cu、Co、Ni),随后将其与商用ZSM-5分子筛物理混合制备了M-ZnZrO_(x)/ZSM-5复合催化剂。在275℃、H_(2)/CO_(2)=3、空速为600 m L/(g·h)的反应条件下,采用质量分数为4%的Fe改性的Fe-ZnZrO_(x)与ZSM-5组成的复合催化剂,芳烃选择性高达80.4%,CO_(2)转化率为5.6%,CO选择性为42.2%。进一步探究了ZnZrO_(x)氧化物上Fe含量对复合催化剂性能的影响,发现Fe含量增加有助于提升反应活性与芳烃选择性;当Fe负载量为8%时,芳烃选择性提升至85.0%。这一研究为在温和条件下通过CO_(2)加氢制备芳烃工业催化剂的开发提供了新思路。展开更多
文摘In recent years,significant breakthroughs have been achieved in the exploration of deep volcanic rocks in the Junggar Basin,highlighting their substantial exploration potential.The complex distribution of volcanic reservoirs is attributed to the multi-phase tectonic evolution within the basin,with their superior reservoir properties playing a crucial role in natural gas formation.However,due to the combined effects of multi-cyclic volcanic eruptions and tectonic activities,predicting volcanic facies distribution and favorable reservoirs remains highly challenging.This study focuses on the third member of the Jiamuhe Formation in the Zhongguai Uplift.By integrating drilling and petrophysical data with well-seismic analysis techniques,a seismic identification model for volcanic reservoirs has been established.The findings reveal that different facies exhibit distinct seismic response characteristics.Andesite,rhyolite,volcanic breccia,and volcanic clastic rocks show variability in amplitude,frequency,and continuity.Using structural-guided filtering,high-resolution coherence analysis,and 3D body carving techniques,the locations of volcanic craters and eruption centers were successfully identified,further clarifying the distribution patterns of volcanic facies.By combining multi-attribute clustering analysis and seismic attribute extraction,a volcanic facies zone distribution map was generated,and favorable exploration directions for volcanic reservoirs were proposed.The study provides technical guidance for the exploration of deep volcanic oil and gas reservoirs in the Junggar Basin and holds significant application value.
基金Supported by the National Natural Science Foundation for Outstanding Young Scholars(52425402)National Natural Science Foundation of China(52341401)International(Regional)Cooperation and Exchange Program of the National Natural Science Foundation of China(W2412078)。
文摘To investigate the fracture initiation and propagation behavior of fractures in tight sandstone under the supercritical CO_(2)(SCCO_(2))shock fracturing,laboratory fracturing experiments were conducted using a true-triaxial-like SCCO_(2)shock fracturing system.Computed tomography(CT)scanning and three-dimensional fracture reconstruction were employed to elucidate the effects of shock pressure,pore pressure,and in-situ stress on fracture characteristics.In addition,nuclear magnetic resonance(NMR)transverse relaxation time spectra were used to assess the internal damage induced by SCCO_(2)shock fracturing.The results indicate that,compared with conventional hydraulic fracturing and SCCO_(2)quasi-static fracturing,SCCO_(2)shock fracturing facilitates multidirectional fracture initiation and the formation of complex fracture networks.Increasing shock pressure more readily activates bedding-plane weaknesses,with main and subsidiary fractures interweaving into a dense fracture network.Under the same impulse intensity,elevated pore pressure reduces the effective normal stress and alters stress-wave scattering paths,thereby inducing more branch fractures and enhancing fracture complexity.An increase in differential in-situ stress promotes fracture propagation along the direction of the maximum principal stress,reduces branching,and simplifies fracture morphology.With increasing SCCO_(2)shock pressure,pore volume and connectivity generally increase:small-to-medium pores primarily respond through increased number and enhanced connectivity;when the shock pressure rises to 40-45 MPa,crack coalescence generates larger pores and fissures,which play a dominant role in improving flow pathways and effective storage space,ultimately forming a multiscale pore-fracture network.
文摘随着全球工业化进程加快,大量二氧化碳被快速地排放到大气中,产生诸多环境问题。CO_(2)作为一种重要的碳资源,通过加氢制备高附加值化学品近年来逐渐受到研究人员广泛关注。芳烃作为一种基本化工原料,传统上主要靠石油裂解和石脑油重整来生产,通过CO_(2)加氢制备芳烃可以有效减缓对化石能源的过度依赖。但是CO_(2)的惰性强、活化能垒高、C–C偶联精准调控难,使低温CO_(2)加氢制备芳烃的高效催化剂开发存在巨大挑战。目前,采用氧化物–分子筛复合催化剂体系可以将CO_(2)加氢合成甲醇与甲醇制芳烃反应进行耦合,实现CO_(2)加氢直接合成芳烃。本文通过共沉淀法制备了ZnZrO_(x)复合氧化物,并采用等体积浸渍法引入不同过渡金属(Fe、Cu、Co、Ni),随后将其与商用ZSM-5分子筛物理混合制备了M-ZnZrO_(x)/ZSM-5复合催化剂。在275℃、H_(2)/CO_(2)=3、空速为600 m L/(g·h)的反应条件下,采用质量分数为4%的Fe改性的Fe-ZnZrO_(x)与ZSM-5组成的复合催化剂,芳烃选择性高达80.4%,CO_(2)转化率为5.6%,CO选择性为42.2%。进一步探究了ZnZrO_(x)氧化物上Fe含量对复合催化剂性能的影响,发现Fe含量增加有助于提升反应活性与芳烃选择性;当Fe负载量为8%时,芳烃选择性提升至85.0%。这一研究为在温和条件下通过CO_(2)加氢制备芳烃工业催化剂的开发提供了新思路。
