本文關鍵詞： 砂體結構 砂體對比 儲層物性 下石盒子組 蘇里格地區(qū)　出處：《成都理工大學學報(自然科學版)》2017年05期 　論文類型：期刊論文

【摘要】：研究鄂爾多斯盆地蘇里格地區(qū)蘇5區(qū)塊下二疊統(tǒng)盒8段砂體特征,確定有利的勘探目標層位。通過巖芯觀察,結合測井解釋成果,對盒8段沉積相進行研究,確定盒8段下部主要發(fā)育緩坡型辮狀河沉積,盒8段上部則主要為多河道低彎度曲流河沉積。根據(jù)測井曲線形態(tài)對盒8段小層砂體進行對比和追蹤,確定盒8段砂體在研究區(qū)中部主要呈近南-北向展布,在研究區(qū)西部主要沿北西-南東向展布,而在研究區(qū)東部則呈北東-南西向展布的特征。綜合砂巖累計厚度對砂體平面展布及演化特征進行研究,認為物源區(qū)構造活動的減緩和河流作用的減弱導致砂體規(guī)模逐漸變小。根據(jù)砂、泥巖厚度及其組合方式的不同,將盒8段砂體劃分為4種結構類型:連續(xù)疊置型、間隔疊置型、互層型和透鏡型。砂體結構與儲集物性存在密切聯(lián)系,連續(xù)疊置型砂體孔隙度和滲透性最高,而透鏡型砂體物性最差,盒8段下部砂體結構及儲集性能明顯優(yōu)于盒8段上部,為最有利的勘探目標層位。
[Abstract]:The sandbody characteristics of Lower Permian Bo8 formation in Su5 Block, Sulige area, Ordos Basin, are studied, and the favorable exploration target horizon is determined. Through core observation and well logging interpretation results, sedimentary facies of Bo8 formation are studied. It is determined that braided river deposits are mainly developed in the lower part of Bo8 formation, and that the upper part of Bo8 member is mainly multi-channel and low-curvature meandering river deposition. According to the logging curve shape, the sand bodies of small bed in Bo8 member are compared and tracked. It is determined that the sandbodies of section 8 are mainly distributed in the central part of the study area in a nearly south-north direction, while in the western part of the study area, they are mainly distributed along the north-west to the south-east direction. In the eastern part of the study area, the characteristics of distribution and evolution of sand body are studied by integrating the cumulative thickness of sandstone. It is considered that the slowing down of tectonic activity and the weakening of fluvial action in the source area result in a gradual decrease in the size of sand bodies. According to the differences of sand and mudstone thickness and their assemblages, the sandbodies of member 8 are divided into four structural types: continuous overlay type and spaced overlay type. The structure of sand body is closely related to the physical properties of reservoir. The porosity and permeability of continuous superimposed sand bodies are the highest, while the physical properties of lens molding sand bodies are the worst. The structure and reservoir properties of sand bodies in the lower part of the box 8 are obviously superior to those in the upper part of the box 8. Is the most favorable target horizon for exploration.
【作者單位】： 油氣藏地質(zhì)及開發(fā)工程國家重點實驗室(成都理工大學);中國石油川慶鉆探工程公司地質(zhì)勘探開發(fā)研究院;中國地質(zhì)大學地球科學與資源學院;
【基金】：國家科技重大專項(2016ZX05007)
【分類號】：P618.13
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本文編號：1534551