本文關(guān)鍵詞： 白云巖化 熱液作用 白云巖儲(chǔ)層 保存條件 油氣成藏　出處：《油氣地質(zhì)與采收率》2017年03期 　論文類型：期刊論文

【摘要】：通過(guò)對(duì)也門1區(qū)塊白云巖分布、巖性特點(diǎn)、顏色以及白云巖礦物電鏡掃描特征的分析,研究白云巖化過(guò)程對(duì)油氣成藏的影響。也門1區(qū)塊白云巖具有厚度大、分布范圍狹窄的特點(diǎn),主要分布在Imad-1井附近。白云石晶體多呈白糖狀,具有鞍狀白云巖的主要特征,雖見介殼化石,但僅保留了原來(lái)的痕跡,且在巖心和薄片中未見生物成因白云巖的球狀、不規(guī)則針刺狀或菱形晶體特征。也門1區(qū)塊白云巖顏色較深,呈灰—深灰色,表明其富含鐵、錳元素。上述特征均指向也門1區(qū)塊白云巖為熱液成因,推測(cè)熱液主要源自深部富含鎂離子的液體,沿不整合面或者斷層滲入到相關(guān)地層中,與地層中富含鈣離子的灰?guī)r、石膏等進(jìn)行交換,最終形成了分布局限、厚度較大的白云巖。白云巖在形成了有利儲(chǔ)集空間的同時(shí),也對(duì)蓋層和保存條件造成了破壞,加上斷層的影響,研究區(qū)東南部區(qū)域形成規(guī)模油氣藏的潛力不大,建議未來(lái)也門1區(qū)塊的勘探應(yīng)集中在西北部的瑪格拉夫勞達(dá)構(gòu)造帶。
[Abstract]:Based on the analysis of dolomite distribution, lithologic characteristics, color and electron microscope scanning characteristics of dolomite minerals in block 1 of Yemen, the influence of dolomitization on oil and gas accumulation is studied. The dolomite in block 1 of Yemen has a large thickness. The distribution of dolomite crystals is mainly in the vicinity of Imad-1 well. The dolomite crystals are mostly sugary and have the main characteristics of saddle dolomite. Although the fossils of the crust are found, only the original traces are retained. Moreover, there are no spherical, irregular needle-like or rhomboid crystal characteristics of biogenic dolomite in cores and thin slices. The dolomite in block 1 of Yemen is dark in color and gray in gray, indicating that it is rich in iron. Manganese elements. All the above characteristics indicate that dolomite in block 1 of Yemen is hydrothermal origin, which is mainly derived from the liquid rich in magnesium ions in the deep, and seeps into the relevant strata along the unconformable surface or fault. The limestone and gypsum which are rich in calcium ions in the strata are exchanged, and finally the dolomite with limited distribution and thick thickness is formed, and the dolomite forms favorable reservoir space at the same time. It has also caused damage to the caprock and preservation conditions, plus the influence of faults, the potential for the formation of large-scale oil and gas reservoirs in the southeastern region of the study area is not large. It is suggested that the exploration of block 1 in Yemen should be concentrated in the northwestern Magaflauda tectonic belt.
【作者單位】： 中國(guó)地質(zhì)調(diào)查局油氣資源調(diào)查中心;中國(guó)石化集團(tuán)國(guó)際石油勘探開發(fā)有限公司;振華石油控股有限公司;
【基金】：中國(guó)石化海外油氣勘探項(xiàng)目“Yemen Shabwa省1區(qū)塊(Amakeen)PSA項(xiàng)目”
【分類號(hào)】：P618.13
【正文快照】： 也門1區(qū)塊目前已有8口探井,全部鉆遇基底,并在部分層段見到一定油氣顯示,尚未有商業(yè)價(jià)值油氣發(fā)現(xiàn)。分析鉆探結(jié)果發(fā)現(xiàn),位于區(qū)塊中南部的Imad-1井與其余7口井巖性顯著不同。其他7口井從侏羅系的休庫(kù)拉組、密穆組、萊姆組一直到白堊系的薩爾組下部所鉆遇地層分別為灰?guī)r、炭質(zhì)灰?guī)r

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