【摘要】：為推算克拉通盆地弱構造變形區(qū)海相沉積期微幅度古地貌,提出了一種基于構造趨勢面轉(zhuǎn)換的沉積期微幅度古地貌推算方法。方法假設克拉通盆地的多階段升降或扭轉(zhuǎn)構造運動表現(xiàn)為構造趨勢面的變動,但該變動并沒有改變局部古高地與其周圍地形的擬構造幅度。該方法的技術流程為,首先利用現(xiàn)今構造圖及其趨勢面求得擬構造幅度;然后將地層剝蝕線的平均走向近似于沉積期構造趨勢面的走向,求得沉積期構造趨勢面傾向;利用將今論古的思想借用現(xiàn)今潮坪相平均坡度作為沉積期構造趨勢面的傾角;最后將沉積期構造趨勢面與擬構造幅度相加即得沉積期古地形圖。在此基礎上,結合取心井的巖石學、白云石化類型,可以更好地確定海相沉積體系中各亞相或微相的分布范圍。將此方法應用于蘇里格氣田東區(qū)下奧陶統(tǒng)馬家溝組五段5亞段潮坪相碳酸鹽巖地層的應用效果表明,研究區(qū)構造趨勢面由NW—SE傾向變動到NE—SW傾向,其并沒有改變沉積期局部古地貌與其周圍地形的相對高低關系,該方法能夠有效地刻畫出潮坪相沉積期微幅度古地貌。沉積期水下微幅度古地貌隆起部位是控制該區(qū)潮坪相碳酸鹽巖顆粒灘分布的關鍵因素,顆粒灘又是后期白云石化并發(fā)育為優(yōu)質(zhì)儲層最有利的微相。因此,在準確刻畫沉積期微幅度古地貌的基礎上可以發(fā)現(xiàn)高產(chǎn)氣井。該方法可以為其他克拉通盆地弱構造變形區(qū)沉積期古地貌研究提供有益的思路。
[Abstract]:In order to calculate the micro-amplitude paleogeomorphology of marine sedimentary period in weak tectonic deformation area of craton basin, a method of calculating micro-amplitude paleogeomorphology of sedimentary period based on structural trend surface transformation is proposed. Methods it is assumed that the multi-stage uplift or torsional tectonic movement of the craton basin is the change of the tectonic trend surface, but this change does not change the pseudotectonic amplitude of the local paleohighlands and their surrounding topography. The technical flow of this method is as follows: firstly, the pseudotectonic amplitude is obtained by using the present tectonic map and its trend surface, then the average strike of the strata denudation line is approximated to the strike of the sedimentary tectonic trend surface, and the tendency of the sedimentary tectonic trend surface is obtained. The present thought of ancient times is used to use the average gradient of the present tidal flat facies as the dip angle of the sedimentary tectonic trend surface, and finally the sedimentary paleotopographic map is obtained by adding the sedimentary tectonic trend surface with the pseudotectonic amplitude. On this basis, combining the petrology of coring wells and dolomitization types, the distribution range of subfacies or microfacies in marine sedimentary system can be better determined. The application of this method to the Chaoping carbonate strata of the 5th member of the Lower Ordovician Majiagou formation in the eastern part of Sulige gas field shows that the tectonic trend surface of the studied area has changed from NW-SE tendency to NE-SW tendency. It does not change the relative relationship between the local paleogeomorphology of sedimentary period and its surrounding topography. This method can effectively depict the micro-amplitude paleogeomorphology of tidal flat facies during sedimentary period. The subaqueous micro-range paleogeomorphic uplift is the key factor to control the distribution of tidal flat carbonate granular beach, which is the most favorable microfacies in late dolomitization and developed into high quality reservoir. Therefore, high-yield gas wells can be found on the basis of accurately depicting the paleogeomorphology of the sedimentary period. This method can provide useful ideas for the study of sedimentary paleogeomorphology in weak tectonic deformation areas of other craton basins.
【作者單位】： 中國石油大學石油工程教育部重點實驗室;中國石油長慶油田公司第五采氣廠;
【基金】：中國石油大學(北京)科研基金項目(2462015YQ0222)資助
【分類號】：P618.13;P531

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