【摘要】：車排子凸起新近系油氣具有“層淺、優(yōu)質(zhì)、高產(chǎn)”等特征,具有很大油氣勘探前景。然而,由于該區(qū)勘探程度總體還較低、巖性油氣圈閉的成藏條件非常復(fù)雜,單獨(dú)運(yùn)用“亮點(diǎn)”模式無法解決該區(qū)勘探問題,特別是沙二段地層巖性,其埋深達(dá)到1600m為其“亮點(diǎn)”門限,故出現(xiàn)早期排2、排8井突破較大,后期排204、208井落空的現(xiàn)象。究其原因,主要是對目的層段砂體分布不明、沉積體系認(rèn)識不清、無法落實(shí)圈閉位置等。針對上述問題,本文在前人研究基礎(chǔ)上,綜合應(yīng)用鉆井和地震資料,首先通過對早中新統(tǒng)沙灣組的層序地層結(jié)構(gòu)分析,建立沙二段層序地層格架樣式;然后選擇S2-3準(zhǔn)層序組為研究對象,通過典型鉆井剖面的速度分析和波形分析,建立砂體識別標(biāo)志;在此基礎(chǔ)上,開展S2-3砂體的地震掃描解釋,再通過砂體邊界分析圈定砂體,展示S2-3砂體平面分布;最后,根據(jù)砂體的剖面結(jié)構(gòu)特征(如前積構(gòu)型)、平面形態(tài)、組合特征的綜合分析標(biāo)定水流方向,進(jìn)而進(jìn)行地震相和沉積相分析,認(rèn)識三角洲—湖相沉積體系。主要進(jìn)展與認(rèn)識概括為以下5個(gè)方面:(1)通過沙灣組層序地層學(xué)分析,將沙灣組劃分為3個(gè)三級層序,發(fā)現(xiàn)這3個(gè)層序基本對應(yīng)前人的沙一段、沙二段和沙三段巖性地層單元劃分。(2)沙灣組的層序地層結(jié)構(gòu)及相分布分析表明,SQ2層序發(fā)育于沙灣組2級層序的湖進(jìn)時(shí)段,即湖盆快速擴(kuò)張期,欠補(bǔ)償沉積造成沉積期的水體開闊且較深,這是S2-3準(zhǔn)層序組發(fā)育于淺湖、半深湖和深湖環(huán)境的主要原因。(3)S2-3砂層組砂體掃描解釋結(jié)果顯示,該砂層組主要發(fā)育河道砂、河口壩、席狀砂、疊覆扇砂。(4)水體體系分析結(jié)果表明,物源主要來自北北西向,三角洲內(nèi)發(fā)育六個(gè)分支河道,這一認(rèn)識進(jìn)一步證實(shí)了徐國強(qiáng)等早期推斷。(5)S2-3沉積體系研究表明,靠近北部隆起帶發(fā)育三角洲沉積體,在前三角洲斜坡和淺湖環(huán)境缺乏砂體堆積,而在欠補(bǔ)償沉積的工區(qū)南緣發(fā)育深水扇沉積體,從而形成大型湖盆緩坡帶的三角洲—深水扇沉積體系。大型湖盆的快速湖進(jìn)及欠補(bǔ)償沉積是形成這種復(fù)雜沉積體系的主要原因。
[Abstract]:The Neogene oil and gas in the Chepeizi uplift has the characteristics of "shallow formation, good quality and high yield", and has great prospects for oil and gas exploration. However, because the exploration degree in this area is still relatively low, and the conditions of reservoir formation in lithologic oil and gas traps are very complex, the application of "bright spot" model alone cannot solve the exploration problems in this area, especially the lithology of the formation of the second member of the Shahejie formation. Its burying depth of 1600m is the "bright spot" threshold, so the phenomenon of early drainage 2, well 8 breaking through, and late well 204208 falling out. The main reasons are that the distribution of sand bodies in the target formation is not clear, the sedimentary system is not clear, and the trap location is unable to be implemented. In view of the above problems, based on the previous studies, this paper synthetically applies drilling and seismic data, firstly through the sequence stratigraphic analysis of the early Miocene Shawan formation, the sequence stratigraphic framework style of the second member of the Shahejie formation is established. Then the S2-3 quasequence group is selected as the research object, and the sand body identification mark is established through velocity analysis and waveform analysis of typical drilling profile. On this basis, the seismic scanning interpretation of the S2-3 sand body is carried out, and then the sand body is delineated by the boundary analysis of the sand body, and the plane distribution of the S2-3 sand body is displayed. Finally, the flow direction is calibrated according to the comprehensive analysis of the profile structural characteristics (such as progradation configuration), plane morphology and assemblage characteristics of the sand body, and then the seismic and sedimentary facies are analyzed, and the delta-lacustrine sedimentary system is recognized. The main progress and understanding are summarized as follows: (1) through sequence stratigraphy analysis of Shawan formation, Shawan formation is divided into three third-order sequences. (2) the sequence stratigraphic structure and facies distribution of the Shawan formation show that the SQ2 sequence developed in the lacustrine stage of the second order sequence of the Shawan formation, that is, the rapid expansion period of the lake basin. The water body of the sedimentary period is open and deep due to uncompensated deposition, which is the main reason that the S2-3 quasequence group developed in shallow lake, semi-deep lake and deep lake environment. (3) the result of S2-3 sand body scanning interpretation shows that the S2-3 sequence formation developed in shallow lake, semi-deep lake and deep lacustrine environment. The sand formation mainly develops channel sand, estuarine bar, sheet sand and overlying fan sand. (4) the results of water system analysis show that the source mainly comes from NNW, and six branch channels are developed in the delta. This understanding further confirmed Xu Guoqiang's early inference. (5) the study of S2-3 sedimentary system shows that delta sedimentary bodies are developed near the northern uplift zone, and there is a lack of sandbody accumulation in the pre-delta slope and shallow lake environment. Deep-water fan sedimentary bodies are developed in the southern margin of undercompensated depositional area, thus forming deltaic deep-water fan sedimentary system in the gentle slope zone of large lake basin. The rapid lacustrine movement and undercompensated deposition of the large lake basin are the main reasons for the formation of this complex sedimentary system.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 吳崇筠;;湖泊沉積相的劃分[J];石油勘探與開發(fā);1981年02期

2 向奎;;準(zhǔn)噶爾盆地車排子地區(qū)下切谷沉積體系及有利勘探方向[J];中國石油大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年06期

3 楊少春;孟祥梅;陳寧寧;張世奇;向奎;;準(zhǔn)噶爾盆地車排子地區(qū)新近系沙灣組沉積特征[J];中國石油大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年02期

相關(guān)碩士學(xué)位論文 前1條

1 花彩霞;車排子凸起春光區(qū)塊沙二段1砂組巖性圈閉預(yù)測[D];成都理工大學(xué);2011年

，

本文編號：2319510