本文選題：丁烷地球化學(xué)特征 + iC_/nC_　； 參考：《天然氣地球科學(xué)》2017年04期

【摘要】：在分析內(nèi)因(有機(jī)質(zhì)類型、有機(jī)質(zhì)成熟度)與外因(生物降解、運(yùn)移)對(duì)天然氣中丁烷地球化學(xué)特征影響的基礎(chǔ)上,探討了丁烷在天然氣研究中的應(yīng)用。首先明確了內(nèi)因、外因?qū)Χ⊥榈厍蚧瘜W(xué)特征的影響:腐殖型有機(jī)質(zhì)生成的煤型氣iC_4/nC_4值、δ~(13)C_4值均高于腐泥型有機(jī)質(zhì)生成的油型氣;iC_4/nC_4值隨成熟度增加而降低,且在成熟階段快速降低、進(jìn)入高成熟階段后緩慢降低;微生物降解會(huì)使得天然氣中iC_4/nC_4值增大,且降解作用越強(qiáng)iC_4/nC_4值越大。而目前有關(guān)運(yùn)移是否會(huì)影響iC_4/nC_4值及如何影響iC_4/nC_4值還存在較大爭(zhēng)議。發(fā)現(xiàn)丁烷在天然氣生物降解、天然氣成因、天然氣成熟度等研究中都有較好的應(yīng)用:iC_4/nC_4值能有效判識(shí)天然氣是否發(fā)生生物降解,生物降解氣iC_4/nC_4值大于2、普遍大于3,iC_4/nC_4值大于3可以判定天然氣發(fā)生生物降解,未降解氣iC_4/nC_4值小于3、普遍小于2,iC_4/nC_4值小于2可以判定天然氣未發(fā)生生物降解;iC_4/nC_4值、δ~(13)C_4值均能有效判識(shí)受外因影響較小天然氣的成因,其判別標(biāo)準(zhǔn)分別為油型氣iC_4/nC_4值小于0.8、煤型氣iC_4/nC_4值大于0.8與油型氣δ~(13)C_4值小于-26‰、煤型氣δ~(13)C_4值大于-26‰;iC_4/nC_4值對(duì)天然氣成熟度判識(shí)也有重要作用。iC_4/nC_4值示蹤天然氣運(yùn)移存在多解性,其有效性也明顯不如其他指標(biāo),應(yīng)慎重選擇其示蹤天然氣運(yùn)移。
[Abstract]:Based on the analysis of the effects of internal factors (organic matter type, maturity of organic matter) and external factors (biodegradation, migration) on the geochemical characteristics of butane in natural gas, the application of butane in natural gas is discussed. Firstly, the effects of internal and external factors on the geochemical characteristics of butane are defined: the value of iC4, 未 ~ (13) C4 of coal-type gas generated by humic organic matter is higher than that of oil-type gas produced by sapropelic organic matter, and the value of IGR 4 / nC4 decreases with the increase of maturity, and decreases rapidly in mature stage. The degradation of microorganism will increase the value of 4 / nCstack in natural gas, and the stronger the degradation effect is, the greater the value of iCstack / nC4 is. At present, there is still controversy about whether migration will affect the value of 4 / nCIV and how to affect the value of 4 / nC4. It is found that butane has a good application in the study of natural gas biodegradation, natural gas genesis, natural gas maturity and so on. It can effectively judge whether natural gas is biodegradable or not. Biodegradable gas iC4 / nC4 is greater than 2, and generally greater than 3% nC4 > 3 can be used to determine the biodegradation of natural gas. If the value of the undegraded gas is less than 3, and generally less than 2iC4 / nC4 is less than 2, it can be determined that there is no biodegradation of natural gas at 4 / nC4. The value of 未 ~ (13) C4 can effectively identify the origin of natural gas that is less affected by external causes. The criteria for the determination are as follows: the value of the oil-type gas Che _ (4) / n _ C _ (4) is less than 0.8, the value of the coal type gas is greater than 0.8 and the value of the oil type gas 未 ~ (13) C _ (4) C _ 4 is less than -26 鈥，

本文編號(hào)：2100769