本文關(guān)鍵詞： 徐家圍子斷陷 火山巖氣藏 斷層封閉性 蓋層封閉性 斷-蓋共控　出處：《東北石油大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：為認(rèn)清徐家圍子斷陷天然氣在斷蓋耦合關(guān)系下的成藏規(guī)律,本文基于徐家圍子三維連片地震處理成果、測井曲線解釋及野外露頭、巖心觀察描述和室內(nèi)分析測試等資料,分析徐家圍子斷陷蓋層的巖性、分布及蓋層內(nèi)砂體連通性等特征,對蓋層進行封閉性評價;分析斷層帶內(nèi)部結(jié)構(gòu)及封閉機理,建立相應(yīng)斷層封閉性定量評價方法,并對斷層控制的天然氣藏內(nèi)斷層封閉性進行定量評價;依據(jù)斷裂對蓋層的破壞程度,分析斷層的頂封能力及對天然氣垂向調(diào)整作用;根據(jù)斷層封閉與天然氣分布關(guān)系,系統(tǒng)總結(jié)不同斷-蓋輸導(dǎo)體系控制的天然氣的成藏模式。徐家圍子斷陷深層天然氣蓋層主要有3種類型,即泥巖、火山巖和泥質(zhì)礫巖,泥巖主要分布在泉頭組與登婁庫組,為徐家圍子斷陷深層天然氣的區(qū)域性蓋層,泥地比50%以上的蓋層具有封閉作用。火山巖以及泥質(zhì)礫巖主要分布在在營城組,為徐家圍子斷陷深層天然氣的直接蓋層,當(dāng)厚度約20m時,可封閉氣柱高度約為120m以下的天然氣藏,對火山巖氣藏起到一定程度的封閉和分隔作用。火山巖斷層帶依靠儲層與上覆泥巖層和礫巖層對接形成封閉,天然氣聚集在斷層的上升盤,氣水界面縱向上受控于火山巖對接的最小深度,在徐中走滑斷層的“海豚效應(yīng)”的影響下,氣藏圍繞斷層呈“正弦”形態(tài)分布。徐家圍子斷陷天然氣藏分布明顯受到登二段蓋層的封隔作用從而可以分為上、下兩套含氣系統(tǒng)。下部含氣系統(tǒng)由火山巖風(fēng)化殼頂面直接蓋層與溝通源巖和儲層的斷層共同控制,斷層上盤下降形成巖性對接封閉,油氣通過斷裂垂向調(diào)整,在直接蓋層的封蓋下在斷層遮擋的構(gòu)造圈閉中聚集成藏;上部含氣系統(tǒng)受斷穿登二段蓋層,并在反轉(zhuǎn)期活動的調(diào)整斷裂控制,即“斷-蓋”配置關(guān)系的控制,斷接厚度小于35m的斷裂是斷陷營城組天然氣向淺層的調(diào)整通道。
[Abstract]:In order to understand the reservoir forming law of natural gas in Xujiaweizi fault depression under the coupling relation of fault cap, this paper bases on the seismic processing results of Xujiaweizi 3-D continuous slice, well logging curve interpretation and field outcrop. The characteristics of lithology, distribution and sand body connectivity in the caprock of Xujiaweizi fault depression are analyzed, and the sealing property of the caprock is evaluated. The internal structure and sealing mechanism of fault zone are analyzed, and the quantitative evaluation method of fault sealing property is established, and the fault sealing property in natural gas reservoir controlled by fault is evaluated quantitatively. According to the failure degree of the fault to the caprock, the top sealing ability of the fault and the vertical adjustment of natural gas are analyzed. According to the relationship between fault sealing and natural gas distribution, the gas accumulation models controlled by different fault-cap transportation systems are systematically summarized. There are three types of deep gas caprock in Xujiaweizi fault depression, that is mudstone. Volcanic rocks and shaly conglomerates, mainly distributed in the Quantou and Dengloku formations, are regional caprocks of natural gas in the deep layer of Xujiaweizi fault depression. Volcanic rocks and shaly conglomerates are mainly distributed in Yingcheng formation, which is the direct caprock of deep natural gas in Xujiaweizi fault depression, when the thickness is about 20m. Natural gas reservoirs with sealed gas column height below 120m play a role in sealing and separating volcanic gas reservoirs to a certain extent. Volcanic fault zones depend on the interfacing of the reservoir with the overlying mudstone and conglomerate layers to form a seal. The natural gas accumulates in the upward disk of the fault, and the gas-water interface is controlled by the minimum depth of the volcanic rock docking longitudinally, under the influence of the "dolphin effect" of the strike slip fault in Xuzhong. The distribution of natural gas reservoirs in Xujiaweizi fault depression is obviously separated by the sealing of the cap bed of the second stage of the Deng Dynasty, so it can be divided into two parts: the gas reservoirs are distributed in a "sinusoidal" shape around the faults. The next two sets of gas-bearing systems. The lower gas-bearing system is controlled by the volcanic weathering crust roof directly and the fault connecting source rock and reservoir. The decline of the upper face of the fault leads to the lithologic docking and sealing, and the oil and gas is adjusted vertically through the fault. Under the cover of the direct caprock, it accumulates to form a reservoir in the structural trap blocked by the fault; The upper gas-bearing system is controlled by fault through the second caprock of the second stage, and by the adjustment of the activity in the reverse period, that is, the "fault-cap" configuration relationship is controlled. The fault whose thickness is less than 35 m is the adjustment channel of natural gas to shallow layer in Yingcheng formation.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P618.13

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