Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment.However,currently there are just a few studies on this subject matter.Therefore,the characteristics of pyrite in orga...Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment.However,currently there are just a few studies on this subject matter.Therefore,the characteristics of pyrite in organic-rich shale section of the Longmaxi Formation and its impact on shale gas enrichment was studied in this paper by using outcrops,drilling cores,thin sections and test data.Result shows that pyrite occurred in different forms(macro-micro scale)in the Longmaxi Formation in the southeast Sichuan Basin.The formation and content of pyrite has a close relation with TOC content.Pyrite may catalyze the hydrocarbon generation of organic matter.Interparticle pores within the pyrite framboids and organic matter pores in the pyrite-organic matter complex are welldeveloped in the Longmaxi Shale,which serves as a major reservoir space for shale gas.Pyrite can promote shale gas enrichment by absorbing shale gas on its surface and preserving free gas in the interparticle pores and organic matter pores.In addition,as a kind of brittle mineral,pyrite can improve the brittleness of shale reservoir and increase the micro-nano pore system in shale reservoir,thereby improving the transmission performance of shale reservoir and boosting shale gas recovery.展开更多
Determination of gas adsorption capacity under geological conditions is essential in evaluating shale gas resource potential.A quantitative determination of gas adsorption capacity was proposed through 1)investigating...Determination of gas adsorption capacity under geological conditions is essential in evaluating shale gas resource potential.A quantitative determination of gas adsorption capacity was proposed through 1)investigating controlling geological factors(including both internal ones and external ones)of gas adsorption capacity in organic-rich marine shale with geochemical analysis,XRD diffraction,field-emission scanning electron microscopy,and methane sorption isotherms;2)defining the relationship between gas adsorption capacity and single controlling factor;3)establishing a comprehensive determination model with the consideration of all these controlling factors.The primary controlling factors of the sorption capacity for the studied O3wLower S1l shale are TOC,illite and quartz,temperature,pressure,Ro,and moisture(water saturation).Specifically,TOC,thermal maturity,illite,and pressure are positively correlated with sorption capacity,whereas,quartz and temperature contribute negatively to the sorption capacity.We present the quantitative model along with application examples from the Wufeng-Lower Longmaxi Shale in the southeast Sichuan Basin,west China,to demonstrate the approach in shale gas evaluation.The result shows that the comprehensive determination model provides a good and unbiased estimate of gas adsorption capacities with a high correlation coefficient(0.96)and bell-shaped residues centered at zero.展开更多
为了探明四川盆地东南部气象因子对杂交中稻产量的影响,并提出相应的丰产技术对策。2015年和2016年,以2个杂交中稻品种II优602和旌优127为材料,在5个播种期和高氮低密与低氮高密2种栽培方式下,研究了四川盆地东南部气象因子对杂交中稻...为了探明四川盆地东南部气象因子对杂交中稻产量的影响,并提出相应的丰产技术对策。2015年和2016年,以2个杂交中稻品种II优602和旌优127为材料,在5个播种期和高氮低密与低氮高密2种栽培方式下,研究了四川盆地东南部气象因子对杂交中稻产量的影响。结果表明,随着播种期推迟,平均全生育期从148.13 d逐渐缩短到123.25 d,缩短了14.77%;气象因子对水稻全生育期的影响主要在营养生长期,生殖生长期受其影响较小。年度间、栽培方式间、品种间稻谷产量差异均不显著;随着播种期推迟,稻谷产量呈下降趋势,从3月5日的8507.76 kg hm^(-2)下降到5月24日的6251.01 kg hm^(-2),降低了26.53%。播种–移栽、移栽–拔节、营养生长的日数和全生育期日数分别与穗粒数和产量呈极显著正相关。气象因子对产量的影响在不同年份和不同品种间的表现不一致:优质稻旌优1272015年的结实率、千粒重和产量分别与齐穗–成熟的日平均气温呈极显著正相关,分别与拔节–齐穗的日照时数呈显著负相关;2016年的穗粒数、产量分别与播种—移栽日最高气温、移栽—拔节的日平均气温呈极显著负相关。高产品种II优602,2015年的有效穗、千粒重和产量分别与移栽—拔节的降雨量呈显著或极显著负相关,2016年的穗粒数和产量分别与移栽–拔节的日最高气温呈显著或极显著负相关,结实率、千粒重和产量分别与拔节–齐穗的日平均相对湿度呈显著正相关。生产上一季中稻模式的最佳播种期在3月5日至3月25日,而中稻-再生稻模式则在3月5日至3月25日期间尽可能早播,以利于提高再生稻安全齐穗保证率。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.41602147,41702149,and 41728004)。
文摘Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment.However,currently there are just a few studies on this subject matter.Therefore,the characteristics of pyrite in organic-rich shale section of the Longmaxi Formation and its impact on shale gas enrichment was studied in this paper by using outcrops,drilling cores,thin sections and test data.Result shows that pyrite occurred in different forms(macro-micro scale)in the Longmaxi Formation in the southeast Sichuan Basin.The formation and content of pyrite has a close relation with TOC content.Pyrite may catalyze the hydrocarbon generation of organic matter.Interparticle pores within the pyrite framboids and organic matter pores in the pyrite-organic matter complex are welldeveloped in the Longmaxi Shale,which serves as a major reservoir space for shale gas.Pyrite can promote shale gas enrichment by absorbing shale gas on its surface and preserving free gas in the interparticle pores and organic matter pores.In addition,as a kind of brittle mineral,pyrite can improve the brittleness of shale reservoir and increase the micro-nano pore system in shale reservoir,thereby improving the transmission performance of shale reservoir and boosting shale gas recovery.
基金supported by the National Natural Science Foundation of China(Grant No.41972160)Open fund of Key Laboratory of oil and gas resources research,Chinese Academy of Sciences(KLOR2018-7).
文摘Determination of gas adsorption capacity under geological conditions is essential in evaluating shale gas resource potential.A quantitative determination of gas adsorption capacity was proposed through 1)investigating controlling geological factors(including both internal ones and external ones)of gas adsorption capacity in organic-rich marine shale with geochemical analysis,XRD diffraction,field-emission scanning electron microscopy,and methane sorption isotherms;2)defining the relationship between gas adsorption capacity and single controlling factor;3)establishing a comprehensive determination model with the consideration of all these controlling factors.The primary controlling factors of the sorption capacity for the studied O3wLower S1l shale are TOC,illite and quartz,temperature,pressure,Ro,and moisture(water saturation).Specifically,TOC,thermal maturity,illite,and pressure are positively correlated with sorption capacity,whereas,quartz and temperature contribute negatively to the sorption capacity.We present the quantitative model along with application examples from the Wufeng-Lower Longmaxi Shale in the southeast Sichuan Basin,west China,to demonstrate the approach in shale gas evaluation.The result shows that the comprehensive determination model provides a good and unbiased estimate of gas adsorption capacities with a high correlation coefficient(0.96)and bell-shaped residues centered at zero.
文摘为了探明四川盆地东南部气象因子对杂交中稻产量的影响,并提出相应的丰产技术对策。2015年和2016年,以2个杂交中稻品种II优602和旌优127为材料,在5个播种期和高氮低密与低氮高密2种栽培方式下,研究了四川盆地东南部气象因子对杂交中稻产量的影响。结果表明,随着播种期推迟,平均全生育期从148.13 d逐渐缩短到123.25 d,缩短了14.77%;气象因子对水稻全生育期的影响主要在营养生长期,生殖生长期受其影响较小。年度间、栽培方式间、品种间稻谷产量差异均不显著;随着播种期推迟,稻谷产量呈下降趋势,从3月5日的8507.76 kg hm^(-2)下降到5月24日的6251.01 kg hm^(-2),降低了26.53%。播种–移栽、移栽–拔节、营养生长的日数和全生育期日数分别与穗粒数和产量呈极显著正相关。气象因子对产量的影响在不同年份和不同品种间的表现不一致:优质稻旌优1272015年的结实率、千粒重和产量分别与齐穗–成熟的日平均气温呈极显著正相关,分别与拔节–齐穗的日照时数呈显著负相关;2016年的穗粒数、产量分别与播种—移栽日最高气温、移栽—拔节的日平均气温呈极显著负相关。高产品种II优602,2015年的有效穗、千粒重和产量分别与移栽—拔节的降雨量呈显著或极显著负相关,2016年的穗粒数和产量分别与移栽–拔节的日最高气温呈显著或极显著负相关,结实率、千粒重和产量分别与拔节–齐穗的日平均相对湿度呈显著正相关。生产上一季中稻模式的最佳播种期在3月5日至3月25日,而中稻-再生稻模式则在3月5日至3月25日期间尽可能早播,以利于提高再生稻安全齐穗保证率。
