【摘要】：砂巖侵入體是由處于淺埋藏階段、尚未固結(jié)的砂質(zhì)沉積物發(fā)生液化并侵入到上覆蓋層所形成的一類軟沉積物變形,在北海盆地維京地塹漸新統(tǒng)地層中非常發(fā)育。為探討砂巖侵入體的形態(tài)特征及誘發(fā)機(jī)制,通過高分辨率三維地震及測井資料,利用地震反射結(jié)構(gòu)分析、地震相干切片等手段對砂巖侵入現(xiàn)象進(jìn)行了識別;并結(jié)合多邊形斷層系統(tǒng)、流體充注與砂巖侵入之間的關(guān)聯(lián)性,對砂巖侵入體的成因機(jī)制進(jìn)行了分析。結(jié)果表明:在地震剖面上可識別的砂巖侵入體多呈V型或W型強(qiáng)振幅反射特征,其橫向展布規(guī)模約1~2 km,垂向侵入高度約100~200 m;流體的大規(guī)模充注及多邊形斷層誘發(fā)蓋層破裂是形成砂體內(nèi)部超壓并誘發(fā)其發(fā)生液化的關(guān)鍵因素。砂巖侵入體在形成之后可以作為流體運(yùn)移通道,對強(qiáng)化流體的垂向運(yùn)移具有重要意義;并且砂巖侵入體本身即可作為油氣的有利儲集體。因此識別并分析砂巖侵入體的成因機(jī)理,對蓋層封閉性評價及油氣勘探具有重要指導(dǎo)意義。
[Abstract]:Sandstone intrusion is a kind of soft sediment deformation formed by liquefaction of unconsolidated sandy sediments in shallow burial stage and invading to the upper overburden. It is very developed in the Oligocene strata of Viking graben in Beihai Basin. In order to study the morphological characteristics and inducing mechanism of sandstone intrusions, the sandstone intrusions are identified by means of high-resolution 3-D seismic and logging data, seismic reflection structure analysis and seismic coherence slicing. The genetic mechanism of sandstone intrusion is analyzed by considering the correlation between fluid filling and sandstone intrusion in polygonal fault system. The results show that the sandstone intrusions which can be identified on the seismic profile are mostly V-type or W-type strong amplitude reflection characteristics, and their lateral distribution scale is about 1 / 2 km, vertical invasion height is about 100m ~ 200m; Large-scale fluid filling and polygonal fault induced caprock fracture are the key factors to form overpressure in sand body and induce liquefaction. Sandstone intrusions can be used as fluid migration channels after formation, which is of great significance for strengthening vertical migration of fluids, and sandstone intrusions themselves can be used as favorable reservoir for oil and gas. Therefore, identifying and analyzing the genetic mechanism of sandstone intrusions is of great significance to the evaluation of sealing property of caprock and oil and gas exploration.
【作者單位】： 中國石油大學(xué)(北京)油氣資源與探測國家重點(diǎn)實(shí)驗(yàn)室;中國石油大學(xué)(北京)地球科學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金項目(41672098)~~
【分類號】：P618.13

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