【摘要】：長(zhǎng)嶺斷陷龍鳳山次凹營(yíng)城組砂體發(fā)育,且毗鄰烴源巖,儲(chǔ)層的含氣性好,具有廣闊的勘探前景。由于龍鳳山次凹仍處于勘探的初期,沉積相及物源的研究仍有待深入。在巖心、測(cè)錄井、地震及薄片資料分析的基礎(chǔ)上,對(duì)其中物源分布、沉積相類型及有利相帶進(jìn)行了深入研究,取得以下成果:在物源分布方面,通過對(duì)碎屑顆粒組分、重礦物組合特征、Q型聚類分析及礫巖/砂巖百分含量分布的研究,認(rèn)為龍鳳次凹營(yíng)城組沉積期物源具有東西分區(qū)、中部混源的特征,且東西物源成分上存在差異,其中西南物源以火山巖和變質(zhì)巖為主,東南物源主要為火山巖。在沉積相分布方面,在沉積相標(biāo)志研究的基礎(chǔ)上,建立龍鳳山地區(qū)不同沉積微相的識(shí)別標(biāo)準(zhǔn),明確研究區(qū)在西南緩坡帶發(fā)育辮狀河三角洲沉積,東南陡坡帶發(fā)育扇三角洲沉積。其中,扇三角洲沉積特征兼具重力流與牽引流的沉積特點(diǎn),沉積物成熟度低,地震上表現(xiàn)為雜亂反射及前積反射。辮狀河三角洲沉積以牽引流搬運(yùn)為特征,不發(fā)育重力流砂體,且形成的規(guī)模大,向湖盆方向推進(jìn)距離遠(yuǎn),在地震上具有典型的S型前積的特征。在單井相、剖面相及平面相研究的基礎(chǔ)上,明確了研究區(qū)沉積相的平面分布及縱向演化特征。從營(yíng)Ⅳ-2小層到營(yíng)Ⅳ-1小層沉積階段,為湖盆的擴(kuò)張期,此時(shí)扇三角洲發(fā)育規(guī)模大,其前緣與辮狀河三角洲前緣相互疊加,呈朵葉狀分布。營(yíng)Ⅲ砂組沉積期,湖盆進(jìn)入了逐漸萎縮階段,盆地主要發(fā)育以辮狀河三角洲為主的沉積體系,扇三角洲規(guī)模小,辮狀河三角洲平原沿F4斷層廣泛分布,前緣呈條帶狀分布。在沉積相研究的基礎(chǔ)上,綜合利用物性測(cè)試、CT掃描、恒速壓汞及鑄體薄片等方法,確定了龍鳳山地區(qū)有利儲(chǔ)集相帶形成機(jī)理與分布特征。其中三角洲外前緣的(含礫)細(xì)砂巖受早期堿性水的控制,早期濁沸石膠結(jié)發(fā)育,同時(shí)毗毗鄰烴源巖,有利于后期有機(jī)酸的進(jìn)入與油氣的充注成藏,是研究區(qū)的有利儲(chǔ)集相帶。
[Abstract]:The sand body of Longfengshan subconcave Yingcheng formation in Changling fault depression is developed and adjacent to the source rock. The reservoir has good gas-bearing property and has broad prospect of exploration. Since the secondary depression of Longfeng Mountain is still in the early stage of exploration, the study of sedimentary facies and source remains to be further studied. Based on the analysis of core, logging, seismic and thin slice data, the distribution of source materials, types of sedimentary facies and favorable facies zones are studied in depth. The following results are obtained: in the distribution of source materials, the components of clastic particles are analyzed. Q cluster analysis of heavy mineral assemblage and study on the percentage distribution of conglomerate / sandstone, it is concluded that the sedimentary source of Longfengciao Yingcheng formation has the characteristics of east-west division, central mixed source, and the difference of east-west source composition. Volcanic rocks and metamorphic rocks are the main provenance in the southwest and volcanic rocks are the main source in the southeast. In terms of sedimentary facies distribution, based on the study of sedimentary facies markers, the identification criteria of different sedimentary microfacies in Longfengshan area were established, and the braided river delta deposits developed in the study area in the southwest gentle slope zone and fan delta deposition in the southeastern steep slope zone. The sedimentary characteristics of fan delta are characterized by both gravity flow and traction flow. The sediment maturity is low, and the seismic features are disorderly reflection and forward reflection. The braided river delta deposit is characterized by traction current transport, no gravity flow sand body, large scale of formation and long distance to the lake basin. It has the characteristic of typical S type foreshadowing on earthquake. Based on the study of single well facies, profile facies and plane facies, the plane distribution and longitudinal evolution characteristics of sedimentary facies in the study area are determined. The sedimentary stage from Ying-鈪，

本文編號(hào)：2145670