【摘要】：前人針對(duì)長嶺凹陷黑帝廟油層成藏規(guī)律開展了系統(tǒng)研究工作,認(rèn)為該區(qū)從沉積演化的歷史來看其第二次湖侵頂峰為嫩二段早期,嫩二段晚期直到嫩五段沉積時(shí)期,湖泊水表現(xiàn)為擴(kuò)張-萎縮的過程,嫩四段沉積時(shí)期,研究區(qū)為水侵特征。在湖盆逐漸萎縮的前提下黑帝廟油層受限于松遼盆地北部物源而形成了三角洲前緣亞相沉積。同時(shí)明確了黑帝廟油層油源為嫩江組烴源巖,嫩一段暗色泥巖厚度60m線控制了油氣顯示范圍;理清構(gòu)造特征,存在大安-新立背斜構(gòu)造帶、乾安-兩井鼻狀構(gòu)造與黑帝廟次凹;利用266口開發(fā)井編制了黑帝廟油層的沉積相展布圖,建立了北部物源由HⅡ3砂組至HⅠ6砂組由北向南逐漸進(jìn)積的沉積模式;總結(jié)了構(gòu)造、斷裂、沉積在油氣成藏中的控制作用,把長嶺凹陷黑帝廟油層劃分為三個(gè)巖性油藏勘探區(qū),即北部沿江構(gòu)造-巖性成藏帶、中部乾安兩井?dāng)鄬訋r性成藏帶和南部大情字井-黑帝廟巖性成藏帶,揭示了2.5億噸資源潛力。而長嶺凹陷三個(gè)構(gòu)造帶黑帝廟油層勘探程度較低,黑帝廟油層一直作為兼探層系,沒有得到足夠的勘探與開發(fā)。因此以乾安-兩井地區(qū)黑帝廟油層為研究重點(diǎn),在總結(jié)前人經(jīng)驗(yàn)的基礎(chǔ)上,以前人資料和勘探成果再認(rèn)識(shí)為線索,通過等時(shí)地層精細(xì)對(duì)比、沉積微相分析、砂體精細(xì)刻畫等手段,開展區(qū)域沉積微相分析,從而優(yōu)選有利目標(biāo)區(qū),并取得了如下認(rèn)識(shí):(1)建立了黑帝廟油層層序地層格架,乾安-兩井地區(qū)黑帝廟油層劃分為3個(gè)中期,5個(gè)短期,并在層序劃分的基礎(chǔ)上,識(shí)別出乾安-兩井地區(qū)黑帝廟油層沉積基準(zhǔn)面變化所反映出水退→水進(jìn)→水退的演化序列。(2)通過取芯井的巖性特征、沉積結(jié)構(gòu)、構(gòu)造、古生物、電性等特征的綜合分析,建立標(biāo)準(zhǔn)微相柱狀圖,明確黑帝廟油層沉積相類型及微相特征,主要發(fā)育水下分流河道、河口壩、席狀砂、疊置席狀砂、前三角洲相。(3)通過巖心觀察分析,密井網(wǎng)解剖,建立砂體識(shí)別標(biāo)準(zhǔn),對(duì)全區(qū)砂體進(jìn)行精細(xì)刻畫。全部砂體一般8-10層,其中骨干砂體4-5層,累計(jì)厚度10m以上,疊加連片展布。(4)通過物源、單井相、剖面相、平面相,由點(diǎn)到面對(duì)全區(qū)黑帝廟油層沉積環(huán)境及沉積相展布進(jìn)行細(xì)致分析,認(rèn)為黑帝廟油層三角洲前緣砂體向湖延伸較遠(yuǎn)是受河控影響較大,波浪的侵蝕速度遠(yuǎn)遠(yuǎn)小于砂體堆積速度。枝狀三角洲呈現(xiàn)出明顯的樹枝狀,各朵體分散、朵體間不連接或通過決口水道連接,呈現(xiàn)出窄條狀的特征。
[Abstract]:According to the history of sedimentary evolution in Heidimiao reservoir, Changling sag, the authors carried out systematic research work, and considered that the peak of the second lake transgression in this area was the early stage of the second member of the Nen member, the late stage of the member of the second member and the period of sedimentation of the fifth member of Nenjiang formation. The lake water is an expansion-atrophy process, and the study area is characterized by water invasion during the depositional period of the fourth member. Under the condition that the lake basin gradually shrinks, the Heidimiao reservoir is limited by the source of the northern Songliao Basin and forms the delta front subfacies deposit. At the same time, it is clear that the source of the Hedimiao reservoir is the source rock of Nenjiang formation, and the dark mudstone thickness 60m line of the first member of Nen control the oil and gas display range, clear up the structural characteristics, exist the Da-Xinli anticline structural belt, the nose structure of Gan'an two wells and the Hedimiao sub-depression; Based on 266 development wells, the sedimentary facies distribution diagram of Heidimiao reservoir is compiled, and the sedimentary model from H 鈪，

本文編號(hào)：2390573