本文選題：松遼盆地　切入點(diǎn)：榆樹斷陷　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著近年松遼盆地東部斷陷帶的深層勘探取得突破,斷陷盆地展現(xiàn)了廣闊的勘探前景。榆樹斷陷位于松遼盆地東南隆起區(qū),是東部斷陷帶內(nèi)的一個(gè)復(fù)合半地塹盆地,由榆東、榆西兩個(gè)次級(jí)斷陷組成,勘探面積2741km2。斷陷層主要由火石嶺組、沙河子組與營城組構(gòu)成。通過對(duì)區(qū)內(nèi)地震資料的閉合解釋,建立了研究區(qū)的地層構(gòu)造格架,結(jié)果顯示榆東、榆西兩個(gè)次級(jí)斷陷均為雁行式組合斷裂控制的半地塹式斷陷復(fù)合體,二者被中部榆樹凸起分隔,并以榆樹凸起為中線,總體形成了鏡像的次級(jí)斷陷組合;火石嶺組地層受控盆斷裂影響較小,廣泛分布于斷陷及榆樹凸起區(qū)域內(nèi),沙河子組及營城組地層受控盆斷裂控制,主要分布于斷陷內(nèi)部。以研究區(qū)內(nèi)6口探井巖心相分析為基礎(chǔ),結(jié)合單井相綜合分析,建立了火石嶺組、沙河子組和營城組的巖相模式。研究區(qū)內(nèi)共識(shí)別出六種巖相,分別是湖泊相、三角洲相、扇三角洲相、湖底扇相、近岸水下扇相和火山巖相,劃分出12種沉積亞相、21種沉積微相;使用地震相識(shí)別方法,建立了區(qū)內(nèi)巖相與地震相對(duì)應(yīng)關(guān)系,恢復(fù)了火石嶺組-營城組的巖相展布。其中火石嶺組主要發(fā)育湖泊—扇三角洲沉積體系,同時(shí)形成了較大規(guī)模的火山爆發(fā)相、溢流相;沙河子組主要發(fā)育半深湖—扇三角洲—近岸水下扇沉積體系;營城組內(nèi)發(fā)育濱淺湖—扇三角洲—近岸水下扇沉積體系,局部發(fā)育少量火山溢流相。巖心測試數(shù)據(jù)結(jié)果統(tǒng)計(jì)顯示,火石嶺組及沙河子組的暗色泥巖為榆樹斷陷的主要烴源巖,地化指標(biāo)顯示其有機(jī)質(zhì)豐度高,干酪根類型以Ⅱ2型為主,處于成熟的演化階段。碎屑巖是區(qū)內(nèi)重要儲(chǔ)集單元,其物性以特低孔、特低滲為特征,且廣泛分布火石嶺組及營城組的火山巖可以提供潛在的儲(chǔ)集空間。榆樹斷陷內(nèi)發(fā)育自生自儲(chǔ)、上生下儲(chǔ)及下生上儲(chǔ)型生儲(chǔ)蓋組合。油氣地質(zhì)條件綜合分析表明,研究區(qū)有利勘探區(qū)帶主要位于榆東次斷陷的中部次凸區(qū),其內(nèi)火山穹窿構(gòu)造帶與厚層優(yōu)質(zhì)半深湖相烴源巖側(cè)向接觸,是油氣勘探的有利目標(biāo)。
[Abstract]:With the breakthrough of deep exploration in the eastern Songliao basin in recent years, the faulted basin presents a broad prospect of exploration. Yushu fault depression is located in the southeast uplift area of Songliao basin, and is a composite semi-graben basin in the eastern fault depression zone. The exploration area is 2741 km2. The fault subsidence is mainly composed of Huoshiling formation, Shahezi formation and Yingcheng formation. Through the close interpretation of seismic data in the area, the stratigraphic structural framework of the study area has been established. The two secondary faults of Yuxi are semi-graben type fault depression complex controlled by echelon type combination fault. They are separated by the middle Yushu uplift, and take the Yushu uplift as the middle line, forming the mirrored secondary fault depression assemblage as a whole. The formation controlled basin fault of Huosiling formation has little influence and is widely distributed in the fault depression and Yushu uplift area, and the controlled basin fault is controlled by Shahezi formation and Yingcheng formation. Based on the core facies analysis of 6 exploration wells in the study area and the comprehensive analysis of single well facies, the lithofacies models of Huosiling formation, Shahezi formation and Yingcheng formation are established. Six kinds of lithofacies are identified in the study area. They are lacustrine facies, delta facies, fan delta facies, sublacustrine fan facies, nearshore underwater fan facies and volcanic facies. Twelve sedimentary subfacies and 21 sedimentary microfacies are divided, and the corresponding relationship between lithofacies and seismic facies in the area is established by using seismic facies identification method. The lithofacies distribution of Huosiling and Yingcheng formation was restored. The Huoshiling formation mainly developed lacustrine fan delta sedimentary system and formed a large scale volcanic eruption facies and overflow facies. In Shahezi formation, there are mainly semi-deep lacustrine-fan deltaic and near-shore underwater fan sedimentary systems, while in Yingcheng formation, shore-shallow lacustry-fan delta-inshore subaqueous fan depositional system is developed, and a few volcanic overflow facies are developed locally. The dark mudstone of Huosiling formation and Shahezi formation is the main source rock of Yushu fault depression. The geochemical index shows that its organic matter abundance is high, the kerogen type is mainly type 鈪，

本文編號(hào)：1628690