發(fā)布時(shí)間：2018-07-25 10:48

【摘要】：為了研究新生代斷陷盆地中油氣分布規(guī)律,在油氣沿?cái)嗔汛瓜蜻\(yùn)移與沿砂體側(cè)向運(yùn)移轉(zhuǎn)換條件研究的基礎(chǔ)上,通過比較斷裂填充物排替壓力與兩側(cè)砂體排替壓力相對大小、泥巖蓋層斷接厚度與其封存油氣的最小斷接厚度相對大小,提出了一套油氣沿?cái)嗔汛瓜蜻\(yùn)移向沿砂體側(cè)向運(yùn)移轉(zhuǎn)換的判別方法:如果斷裂填充物排替壓力大于兩側(cè)砂體排替壓力,油氣沿?cái)嗔汛瓜蜻\(yùn)移向沿砂體側(cè)向運(yùn)移轉(zhuǎn)換,反之則不能轉(zhuǎn)換;如果泥巖蓋層厚度小于其封存油氣的最小斷接厚度,油氣沿砂體側(cè)向運(yùn)移向沿?cái)嗔汛瓜蜻\(yùn)移轉(zhuǎn)換,反之則不能轉(zhuǎn)換.將此方法分別應(yīng)用于渤海灣盆地南堡凹陷南堡1號(hào)和2號(hào)構(gòu)造和冀中坳陷文安斜坡沙一段油氣運(yùn)移轉(zhuǎn)換的判別中,結(jié)果表明:南堡1號(hào)和南堡2號(hào)構(gòu)造油氣沿?cái)嗔汛瓜蜻\(yùn)移向沿東營組34個(gè)砂層側(cè)向運(yùn)移轉(zhuǎn)換,有9個(gè)砂層未發(fā)生側(cè)向運(yùn)移轉(zhuǎn)換;文安斜坡在東部和西部的中部地區(qū)沙一段油氣沿砂體側(cè)向運(yùn)移向沿?cái)嗔汛瓜蜻\(yùn)移轉(zhuǎn)換,而其余地區(qū)未發(fā)生沿?cái)嗔汛瓜蜻\(yùn)移轉(zhuǎn)換.這些判別結(jié)果分別與目前南堡1號(hào)和2號(hào)構(gòu)造東營組、文安斜坡沙一段和東營組已發(fā)現(xiàn)油氣分布相吻合,表明該方法用于判別沿?cái)嗔汛瓜蜻\(yùn)移與沿砂體側(cè)向運(yùn)移轉(zhuǎn)換的合理性.
[Abstract]:In order to study the distribution of oil and gas in Cenozoic faulted basins, on the basis of studying the conditions of vertical migration and lateral migration of oil and gas along the fault, the relative magnitude of displacement pressure of fault fillers and sand bodies on both sides is compared. The fracture thickness of mudstone caprock is relative to the minimum fracture thickness of its sealed oil and gas. In this paper, a set of discriminant methods for the vertical migration of oil and gas along the fault to the lateral migration of the sand body is presented. If the displacement pressure of the fault filler is greater than that of the two sides of the sand body, the oil and gas migrates vertically along the fault to the side of the sand body. If the thickness of the mudstone caprock is less than the minimum fault thickness of the seal oil and gas, the oil and gas migration along the side of the sand body to the vertical migration along the fault can not be converted. The method is applied to the discrimination of oil and gas migration and transformation of No.1 and No.2 structures in Nanbao Sag, Bohai Bay Basin, and Sha 1 member of Wenan Slope in Jizhong Depression, respectively. The results show that the oil and gas of Nanpu 1 and Nanbao 2 structures are migrated vertically along the fault to the 34 sand beds of Dongying formation laterally, and no lateral migration transition occurs in 9 sand beds. The oil and gas of Shayi formation in east and west of Wenan slope are migrated along the side of the sand body to the vertical direction of the fault, but there is no vertical migration transformation along the fault in the rest of the area. These results are in agreement with the oil and gas distribution found in the first member and Dongying formation of Wenan Slope in Dongying formation of No.1 and No.2 structures, respectively, indicating the rationality of this method in distinguishing vertical migration along the fault and lateral migration along the sand body.
【作者單位】： 東北石油大學(xué)地球科學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41372154)
【分類號(hào)】：P618.13

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