發(fā)布時間：2018-05-29 08:08

  本文選題：四川盆地 + 中下三疊統(tǒng)�。� 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：隨著中國經(jīng)濟的快速發(fā)展,鉀鹽資源的需求增大,在中國的各大沉積盆地陸續(xù)都展開了鉀鹽資源勘探工作。四川盆地作為我國重要的沉積盆地,鹵水資源豐富,特別是在三疊系地層中發(fā)現(xiàn)了富鉀鹵水,極具開發(fā)利用價值。本文研究四川盆地中下三疊統(tǒng)鹽鹵水的水文地球化學(xué)特征,總結(jié)了四川盆地的演化歷史以及三疊系地層巖性,地質(zhì)構(gòu)造等水文地質(zhì)條件,分析了四川盆地中下三疊統(tǒng)鹽鹵水水化學(xué)組成,礦化度及水化學(xué)常規(guī)組分的分布特征,并按照四川盆地三疊系含水層的水文地質(zhì)條件差異,將其分成了多個區(qū)域,分析了各區(qū)的水化學(xué)組成,離子比例系數(shù),并同海水蒸發(fā)各階段的海水水化學(xué)組成對比。然后,對四川盆地部分鹽鹵水的氫氧、硫、硼同位素和氣體組分的特征進(jìn)行了分析。最后,追溯鹽鹵水的演化過程,討論了不同的水文地球化學(xué)過程對鹽鹵水成分的影響。主要取得了以下幾點認(rèn)識:1、四川盆地為一個多巖層平行疊置的自流水盆地,自上而下可以分成多個含水層,中下三疊系地層作為其中一個主要的含水層,大部分深埋盆地腹地,含水層的邊界受到區(qū)域斷裂控制,含水層的巖性以碳酸鹽類為主,在嘉陵江和雷口坡組中地層有多個穩(wěn)定的儲鹵層。2、四川盆地中下三疊統(tǒng)鹽鹵水的礦化度差異較大,常量組分以Cl-、Na+為主,SO42-與HCO3-含量較低,部分微量含量較高,水化學(xué)類型以Cl-Na型水主。對盆地內(nèi)不同區(qū)域中下三疊統(tǒng)地層中鹽鹵水水化學(xué)組分對比分析發(fā)現(xiàn),川北、川西的鹽鹵水礦化度、Cl-和Na+含量較高;川南與川東的SO42-的含量較高;盆地內(nèi)Mg2+、HCO3-的含量都很低,盆地內(nèi)各區(qū)差異不大;川北和川中的Ca2+含量較高;川西和川東北部分K+含量異常高。3、通過水化學(xué)組分相關(guān)性分析發(fā)現(xiàn),四川盆地中下三疊統(tǒng)鹽鹵水的礦化度與Cl-、Na+的相關(guān)性良好,而與HCO3-相關(guān)性較差,與SO42-呈現(xiàn)負(fù)相關(guān)。R型聚類分析表明,川西,川北、川西南地區(qū)的鹽鹵水具有相似的水化學(xué)成因。因子分析的結(jié)果表明,對研究區(qū)鹽鹵水水化學(xué)成分影響最大的是石鹽、鉀鹽以及方解石和白云石的溶濾作用。對研究區(qū)鹽鹵水離子比例系數(shù)分析表明,各區(qū)鹵水都顯示了溶濾水的特征,川西、川中、川東北地區(qū)的鹽鹵水儲層封閉程度較好,后期伴有強烈的變質(zhì)作用。根據(jù)離子比例系數(shù)的Q型聚類分析表明,川西和川中的鹽鹵水的成因較為類似,而與盆地其他地區(qū)如川東和川南的成因差異較大。4、同海水蒸發(fā)濃度各階段的海水水化學(xué)組分對比發(fā)現(xiàn),研究區(qū)鹽鹵水的Na+、Cl-、K+隨礦化度變化與海水蒸發(fā)類似,說明鹽鹵水同海相沉積關(guān)系密切,Mg2+的含量較海水蒸發(fā)同期低,Ca2+的含量較海水蒸發(fā)同期高,說明在鹵水演化過程中發(fā)生了白云巖化作用和陽離子交換作用,SO42-含量較海水蒸發(fā)同期低,這是由于厭氧細(xì)菌通過生物化學(xué)作用將SO42-分解成為H2S所致。5、研究區(qū)鹽鹵水δD值為㧟7~㧟46‰,δ18O值為+1‰~+8‰,d值為㧟31~㧟66‰,其氫氧同位素組分接近原始海水,后期演化過程中受蒸發(fā)、地表水補給和周圍石膏脫出的結(jié)晶水的影響,造成氫同位素組成略低于海水,水巖交換作用導(dǎo)致氧同位素組成偏高。研究區(qū)鹽鹵水δ34S的值為㧟15~㧟37‰,硫同位素與同層的硬石膏具有同源性,川25井的δ34S值異常高,反應(yīng)了極強的生物化學(xué)作用。6、研究區(qū)鹽鹵水方解石、白云石大多處于飽和狀態(tài),石膏、巖鹽以及鉀鹽處于未飽和狀態(tài),反向模擬實驗結(jié)果表明,形成富鉀鹵水需要溶濾富鉀礦物。研究區(qū)鹽鹵水的演化可以概括為三個階段。沉積水形成階段:原始沉積水多源自海水,當(dāng)時盆地內(nèi)海水濃度程度普遍到達(dá)了瀉利鹽沉積階段。封閉埋藏階段:川南部分地區(qū)由于構(gòu)造隆起,其沉積水受到了大氣降水的淋濾的影響,盆地大部分地區(qū)沉積水都受到了相鄰巖層石膏脫水以及白云巖化的陽離子改造作用的影響。后期改造階段:部分構(gòu)造作用強烈區(qū)域的鹽鹵水溶濾相鄰鹽層的富鉀礦物形成了富鉀鹵水。
[Abstract]:With the rapid development of China's economy and the increasing demand for potash resources, the exploration of potash resources has been carried out in the major sedimentary basins in China. As an important sedimentary basin in China, the Sichuan basin is rich in brine resources, especially in the Triassic strata, which has great potential for exploitation and utilization. This paper studies the Sichuan basin. The hydrogeochemical characteristics of the salt brine in the middle and lower three strata of the middle and lower strata, summarized the evolution history of the Sichuan basin and the hydrogeological conditions of the Triassic stratum lithology and geological structure, and analyzed the chemical composition of the salt brine water in the middle and lower middle three series of the Sichuan Basin, the mineralizing degree and the distribution characteristics of the conventional components of the hydrochemistry, and according to the Triassic water cut in the Sichuan basin. The hydrogeological conditions of the layer are divided into several regions, and the hydrochemical composition, the ion ratio coefficient and the chemical composition of the sea water in each stage of the seawater evaporation are analyzed. Then, the characteristics of the hydrogen, oxygen, sulfur, boron isotopes and the gas composition of the salt brine in the Sichuan basin are analyzed. Finally, the salt brine is traced. The evolution process has discussed the effects of different hydrogeochemical processes on the composition of salt brine. 1, the Sichuan basin is a parallel stacked self flowing basin with multiple strata, which can be divided into several aquifers from top to bottom, and the middle and lower Triassic strata are one of the main aquifers and most of the deep buried basins. In the hinterland, the boundary of aquifers is controlled by regional fracture, and the lithology of aquifers is dominated by carbonate. In the Jialing River and Lei Kou Poe formation, there are many stable halogen layers.2. The salinity of salt brine in the middle and lower three halides of the Sichuan basin is different, the component of the permanent component is Cl-, Na+ is the main, the content of SO42- and HCO3- is lower, and some trace content is high. The hydrochemical type is Cl-Na type water main. The comparison and analysis of the chemical composition of salt brine water in the middle and lower three strata of different regions in the basin shows that the salinity of salt brine, Cl- and Na+ content in the North Sichuan and Western Sichuan are higher; the content of SO42- in South and East Sichuan is higher; the content of Mg2+, HCO3- in the basin is very low, and the differences in each region in the basin are not very different; North Sichuan and Sichuan The content of Ca2+ in the Western Sichuan and northeastern Sichuan is very high, and the content of K+ is very high.3. Through the correlation analysis of hydrochemical components, it is found that the salinity of the salt brine in the middle and lower middle three series of the Sichuan basin is well correlated with Cl- and Na+, but the correlation with HCO3- is poor, and the negative correlation.R type cluster analysis with SO42- shows that the salt brine in Western Sichuan, North Sichuan and southwest Sichuan. Water has similar hydrochemical causes. The result of factor analysis shows that the greatest influence on the chemical composition of salt brine water in the study area is the dissolution and filtration of calcite and calcite and dolomite. The analysis of the ratio coefficient of the salt brine ions in the study area shows that the brine in the region shows the characteristics of the water soluble and filtration water, in Western Sichuan, in Sichuan and Northeast Sichuan. The salt brine reservoir has a better sealing degree and later strong metamorphism. According to the Q cluster analysis of the ion ratio coefficient, the cause of the salt brine in the Western Sichuan and Sichuan is similar, but the difference from the other parts of the basin, such as East Sichuan and South Sichuan, is larger than that of.4, and the comparison of the chemical composition of seawater hydrochemical components at each stage of the evaporation concentration in the sea water is found. The change of Na+, Cl- and K+ with salinity in the salt brine of the study area is similar to that of seawater evaporation, indicating that the salt brine is closely related to the marine deposition, the content of Mg2+ is lower than that of the evaporation at the same period in the sea water, and the content of Ca2+ is higher than that of the evaporation at the same period in the sea water. It shows that the dolomitization and cation exchange of the brine have occurred in the process of the evolution of the brine, and the content of SO42- is more evaporation than the evaporation of the sea water. The same period is low, because anaerobic bacteria decompose SO42- into.5 caused by H2S by biochemical action. The delta D value of the salt brine in the study area is 7~? 46 per thousand, the value of delta 18O is +1 per thousand ~+8 per thousand, D value is 31~? 66 per thousand, and its hydrogen and oxygen isotopes are close to the original sea water, and the effect of evaporation, surface water supply and the effect of the crystalline water out of the surrounding gypsum during the later evolution process The composition of hydrogen isotopes is slightly lower than that of sea water, and the oxygen isotope composition of the water and rock exchange results in high oxygen isotope composition. The value of the salt water delta 34S is 15~? 37 per thousand, the sulfur isotope is homologous to the anhydrite of the same layer, the delta 34S value of the 25 well in Sichuan is very high, which reacts the very strong biochemical action of the salt brine, and the salt brine calcite in the study area is mostly in the dolomite. The saturated state, gypsum, rock salt and potassium salt are in the unsaturation state. The results of the reverse simulation experiment show that the formation of potassium rich brine needs to be dissolved in the potassium rich mineral. The evolution of salt brine in the study area can be summarized as three stages. The formation stage of the sedimentation water is that the original sedimentary water is mainly from the sea water, and the degree of seawater concentration in the basin generally reached the salting salt at that time. The sedimentary stage, closed burial stage: due to tectonic uplift in some parts of South Sichuan, its sedimentation is affected by the leaching of atmospheric precipitation, and the sedimentary water in most of the basin is affected by the cation transformation of gypsum dehydration and dolomitization of the adjacent rock strata. Water - soluble potassium rich minerals from adjacent salt beds form potassium rich brines.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.211

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 宋鶴彬;川西成都鹽盆平落4井富鉀硼溴濃鹵水水化學(xué)同位素地球化學(xué)特征及形成機制[J];地球?qū)W報;1997年03期

2 韓蔚田,蔡克勤;鹽類沉積地?zé)嶙冑|(zhì)作用的物理化學(xué)分析[J];地質(zhì)科學(xué);1981年03期

3 李亞文,韓蔚田;NaCl不飽和的海水體系鹵水-礦物平衡研究[J];地質(zhì)論評;1997年05期

4 陳郁華;;黃海水25℃恒溫蒸發(fā)時的析鹽序列及某些微量元素的分布規(guī)律[J];地質(zhì)學(xué)報;1983年04期

5 林耀庭,卞慕英;碳酸鹽組分在四川盆地三疊紀(jì)蒸發(fā)巖系中的分布及其成鹽標(biāo)志研究[J];化工礦產(chǎn)地質(zhì);2001年03期

6 楊立中;論四川盆地地下鹵水資源開發(fā)利用的現(xiàn)狀及對策[J];四川地質(zhì)學(xué)報;1992年03期

相關(guān)碩士學(xué)位論文 前1條

1 劉陽;四川盆地上三疊統(tǒng)盆地模擬關(guān)鍵參數(shù)研究[D];成都理工大學(xué);2011年

，

本文編號：1950138