【摘要】：東辛油田永3斷塊區(qū)位于東營凹陷的東北部、民豐洼陷東南部,受一條北界南傾近東西向的永3三級斷層控制,為傾向向南的斷鼻構(gòu)造,主要含油層位為沙河街組二段。目前永3斷塊已進入特高含水的開發(fā)后期,低級序斷層廣泛發(fā)育且分布位置識別不清,導(dǎo)致現(xiàn)有注采井網(wǎng)不匹配、注水開發(fā)矛盾嚴重,采收率效率低。本論文綜合利用測井、地質(zhì)、地震以及生產(chǎn)開發(fā)資料,開展了研究區(qū)地層劃分與對比、主斷裂特征分析、低級序斷層的井震結(jié)合識別、低級序斷層分布特征和分布模式,以及低級序斷層對注水開發(fā)影響等研究,主要取得了以下成果和認識:(1)建立了永3斷塊區(qū)沙河街組二段地層格架,認為研究區(qū)沙二段砂體分布及連通特征受斷層影響最大。南北向的剖面呈地塹狀,發(fā)育一系列階梯狀的斷層。東西向的剖面呈地壘狀,兩側(cè)的斷裂呈階梯狀分布。(2)三維地震剖面中主斷裂相互呈“y”形斜交,整體為以寬緩地塹為主。平面上永3斷塊呈南傾的斷鼻構(gòu)造,內(nèi)部發(fā)育兩個北傾的次級斷鼻構(gòu)造控塊斷層系。(3)螞蟻追蹤識別低級序斷層效果受參數(shù)設(shè)置影響,垂向掃描步長、初始邊界等5個參數(shù)對低級序斷層平面延伸長度效果影響較大,而非法步長和合法步長影響較小。測井識別的單井斷點與螞蟻追蹤識別出的低級序斷層的斷裂痕跡相重合,具有良好的匹配性,井震結(jié)合精細刻畫了研究區(qū)低級序斷層的展布。(4)研究區(qū)低級序斷層大部分屬于高角度斷層,以五級、六級斷層為主;主要分布在高級序斷層的下降盤,且在各類背斜上總體形成放射狀的低級序斷層組合樣式,在緩坡帶斷塊區(qū)形成以“y”型、地塹型和階梯型為主的低級序斷層組合,在深洼區(qū)周邊斷裂帶發(fā)育區(qū)主要形成地塹型和“y”型低級序斷層組合。(5)五級斷層控制剩余油分布,六級斷層影響注采井網(wǎng)部署,建立了高級序斷層與低級序斷層聯(lián)合控制型、低級序斷層內(nèi)部的組合樣式控制型兩種模式。
[Abstract]:The Yong3 fault block in Dongxin oilfield is located in the northeast of Dongying sag and in the southeast of Minfeng sag. It is controlled by a third stage fault of Yong3, which is trending south towards east to west. The main oil-bearing layer is the second member of Shahejie formation. At present, Yong3 fault block has entered the late stage of super high water cut, the low order fault is widely developed and the distribution location is not clear, which leads to the mismatch of the existing injection-production pattern, the serious contradiction of water injection development, and the low recovery efficiency. Based on the data of logging, geology, seismology and production and development, this paper has carried out stratigraphic division and correlation of study area, analysis of main fault characteristics, combined identification of well and earthquake of low-grade sequence fault, distribution characteristics and distribution pattern of low-grade sequence fault. As well as the influence of low-grade sequence faults on waterflooding development, the following achievements and understandings have been obtained: (1) the formation framework of the second member of Shahejie formation in Yong3 fault block has been established. It is considered that the distribution and connectivity characteristics of sand bodies in the second member of sand in the study area are most affected by faults. The south-north profile is graben-like and a series of ladder-like faults are developed. The east-west profile shows a barrier shape, and the faults on both sides are stair-like. (2) in the 3D seismic profile, the main faults are "y" oblique and the whole is a wide and gentle graben. The fault nose structure of Yong3 fault block is trending to the south on the plane, and two northerly fault-nose structure fault systems are developed inside. (3) the effect of ant tracking identification of low order fault is affected by the setting of parameters and the vertical scanning step. Five parameters, such as the initial boundary, have a great effect on the extension length of the low-order fault plane, but the illegal step size and the legal step length have little effect. The single well fracture point identified by logging coincides with the fault trace of low order fault identified by ant tracking, and it has good matching property. Well earthquakes combined with fine description of the distribution of low-grade sequence faults in the study area. (4) most of the low-grade sequence faults in the study area belong to high-angle faults, mainly of magnitude five and six. It mainly distributes in the descending face of the high order fault, and generally forms the radial low order fault combination style on all kinds of anticlines, and forms the "y" type, graben type and ladder type low order fault combination in the fault block area of the gentle slope belt. The low order fault assemblages of graben type and y type are mainly formed in the developed area of the fault zone around the deep depression area. (5) the fifth grade fault controls the remaining oil distribution, and the sixth grade fault affects the layout of injection-production well pattern. Two types of combined control mode of high sequence fault and low sequence fault and combined style control type of low order fault are established.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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