【摘要】：它日錯(cuò)地區(qū)是措勤盆地海相沉積儲(chǔ)層中重要的發(fā)育區(qū)域,區(qū)域內(nèi)下白堊統(tǒng)地層被認(rèn)為是措勤盆地重要烴源巖。本文以沉積地質(zhì)學(xué)和有機(jī)地球化學(xué)理論為基礎(chǔ),針對(duì)它日錯(cuò)地區(qū)下白堊統(tǒng)(包括郎山組和多尼組)進(jìn)行了野外地質(zhì)調(diào)查、剖面實(shí)測(cè)、室內(nèi)烴源巖分析,詳細(xì)研究了下白堊統(tǒng)兩套烴源巖(郎山組和多尼組)的沉積特征和有機(jī)地球化學(xué)特征,主要取得了以下認(rèn)識(shí):充分利用野外剖面實(shí)測(cè)資料,對(duì)研究區(qū)沉積特征和巖相進(jìn)行了厘定:它日錯(cuò)地區(qū)下白堊統(tǒng)主要的沉積類型郎山組為一套淺海碳酸鹽巖臺(tái)地相沉積,含有豐富的生物碎屑;多尼組為一套正常的碎屑巖為主,主要發(fā)育三角洲相。結(jié)合研究區(qū)烴源巖樣品的有機(jī)地球化學(xué)分析數(shù)據(jù),主要通過下白堊統(tǒng)烴源巖的有機(jī)碳(TOC)、氯仿瀝青 A‖、鏡質(zhì)體反射率(Ro)、熱解峰溫(Tmax)、干酪根顯微組分鑒定、碳同位素檢測(cè)、有機(jī)元素檢測(cè)的組成等研究?jī)?nèi)容進(jìn)行了數(shù)據(jù)處理和分析,結(jié)果顯示郎山組碳酸鹽巖約90%的樣品已達(dá)到了烴源巖水平,多尼組整體顯示為較差的烴源巖和未達(dá)到烴源巖標(biāo)準(zhǔn)。下白堊統(tǒng)烴源層整體的有機(jī)質(zhì)類型為Ⅱ2-Ⅲ型:郎山組有機(jī)質(zhì)類型以Ⅱ2型為主,多尼組為Ⅱ2-Ⅲ型。熱演化程度整體處于成熟-高成熟階段,并以成熟階段為主,其中郎山組的成熟度顯示高于多尼組。因此,郎山組生烴潛力較好于多尼組。綜合分析了下白堊統(tǒng)烴源巖的生物標(biāo)志化合物,郎山組樣生烴母質(zhì)以低等水生生物為主,為水體較深的咸水還原環(huán)境;多尼組烴源巖生烴母質(zhì)以低等水生生物為主,也有部分高等植物的貢獻(xiàn),形成于水體較深,鹽度不高的半咸水環(huán)境。兩組均已達(dá)到了成熟界限,相對(duì)來看,郎山組烴源巖樣品的成熟度比多尼組烴源巖高。
[Abstract]:The Tarijiao area is an important developing area in the marine sedimentary reservoirs of the Cuoqin Basin, and the Lower Cretaceous strata in the region are considered as the important source rocks of the Cretaceous Basin. Based on the theory of sedimentary geology and organic geochemistry, the field geological survey, profile measurement and indoor source rock analysis of the Lower Cretaceous (including Langshan formation and Doni formation) have been carried out in this paper. The sedimentary and organic geochemical characteristics of two sets of lower Cretaceous source rocks (Langshan formation and Doni formation) are studied in detail. The sedimentary characteristics and lithofacies of the study area are determined as follows: the main sedimentary type of Lower Cretaceous is Langshan formation, which is a set of shallow sea carbonate platform facies, and is rich in bioclastic rocks, while the Doni formation is dominated by a set of normal clastic rocks. The delta facies are mainly developed. Combined with the organic geochemical analysis data of source rock samples in the study area, the organic carbon (TOC), chloroform bitumen of Lower Cretaceous source rocks, vitrinite reflectance (Ro), pyrolysis peak temperature (Tmax), kerogen macerals, and carbon isotope detection were used. Data processing and analysis of the composition of organic elements have been carried out. The results show that about 90% of the carbonate rock samples in Langshan formation have reached the source rock level, while the Doni formation as a whole shows poor source rock and does not meet the source rock standard. The type of organic matter in the lower Cretaceous source bed is type 鈪，

本文編號(hào)：2143510