本文選題：川西南 + 構(gòu)造復(fù)雜區(qū)　； 參考：《新疆石油地質(zhì)》2017年04期

【摘要】：深入研究川西南構(gòu)造復(fù)雜區(qū)下志留統(tǒng)龍馬溪組泥巖沉積環(huán)境,指導(dǎo)區(qū)域頁(yè)巖氣的勘探開發(fā),對(duì)該地區(qū)滎經(jīng)縣泥巴山剖面龍馬溪組泥巖進(jìn)行系統(tǒng)采樣,開展了元素地球化學(xué)研究。結(jié)果表明,研究區(qū)平均化學(xué)蝕變指數(shù)為68,略低于世界頁(yè)巖的平均化學(xué)蝕變指數(shù)70,Th/U為3.73,與大陸地殼Th/U平均值3.80接近,表明物源區(qū)曾遭受低—中度風(fēng)化;較高含量的易水解元素、鐵族元素及較低含量的親硫元素,表明沉積水體為濱淺海環(huán)境。氧化還原指標(biāo)δU,U/Th,V/Cr及Ni/Co均說(shuō)明沉積水體為弱氧化環(huán)境,且越到龍馬溪組沉積晚期氧化性越強(qiáng)。古氣候指標(biāo)Sr/Cu說(shuō)明源區(qū)沉積期氣候干旱,古鹽度指標(biāo)Sr/Ba,B/Ga說(shuō)明研究區(qū)龍馬溪組為半咸水海相沉積。研究區(qū)總有機(jī)碳含量較低,且與風(fēng)化指標(biāo)、氧化還原指標(biāo)、古鹽度古氣候指標(biāo)均有較好的相關(guān)性,說(shuō)明總有機(jī)碳含量受沉積環(huán)境的控制。研究區(qū)龍馬溪組為一套深水—淺水陸棚相烴源巖,受沉積環(huán)境及構(gòu)造隆升的影響,其下段有機(jī)質(zhì)品質(zhì)相對(duì)較好,上段品質(zhì)較差。
[Abstract]:The sedimentary environment of the Lower Silurian long MXI formation in the Lower Silurian strata in the southwestern Sichuan Province is deeply studied, and the exploration and development of the shale gas in the region is guided. The systematic sampling of the mudstone of the long Ma Xi formation in the mud mountain section of the Xing Jing County in this area has been systematically sampled and the geochemical study of the element is carried out. The results show that the average chemical alteration index of the study area is 68, slightly lower than that of the world shale. The average chemical alteration index is 70, Th/U is 3.73, which is close to the average value of the continental crust Th/U 3.80, indicating that the source area has suffered from low to moderate weathering, the high content of easily hydrolyzed elements, the iron element and the lower content of sulphur elements, indicating that the sedimentary water is the coastal shallow sea environment. The original index of delta U, U/Th, V/Cr and Ni/Co all indicate that the sedimentary water body is weak. The higher the oxidation environment is, the more advanced the late oxidation of the long Ma Creek formation is stronger. The paleoclimate index Sr/Cu shows that the climatic drought in the sedimentary period of the source area, the paleosalinity index of Sr/Ba, and the B/Ga of the long Ma Xi formation in the study area are half salty water marine sediments. The total organic carbon content of the study area is low, and the index of weathering, redox index and paleoclimate paleoclimate index are all compared. The good correlation shows that the total organic carbon content is controlled by the sedimentary environment. The Longma Creek formation in the study area is a set of deep-water shallow water shelf facies hydrocarbon source rocks, which are affected by the sedimentary environment and tectonic uplift, and the lower quality of the upper part of the organic matter is relatively good.

【作者單位】： 中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;成都理工大學(xué)地球科學(xué)學(xué)院;國(guó)土資源部沉積盆地與油氣資源重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)大學(xué)地球科學(xué)學(xué)院;
【基金】：國(guó)家科技重大專項(xiàng)(2016ZX05034004)
【分類號(hào)】：P618.13

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