【摘要】：隨著塔河油田油氣勘探程度的不斷加大,再尋找一定規(guī)模的構(gòu)造圈閉油氣藏已經(jīng)非常困難了,隱蔽性油氣藏越來(lái)越成為關(guān)注的主要目標(biāo)。三疊系哈一段的巖性圈閉勘探程度還比較低,開展巖性圈閉識(shí)別與評(píng)價(jià)研究對(duì)后期油氣的滾動(dòng)開發(fā)具有重大意義。論文以經(jīng)典的層序地層學(xué)、沉積學(xué)、石油地質(zhì)學(xué)基礎(chǔ)理論為指導(dǎo),根據(jù)巖心、測(cè)井、界面等特征,將哈拉哈塘組分為1個(gè)長(zhǎng)期旋回(LSC1)和3個(gè)中期旋回(TMSC1-TMSC3)。中期旋回TMSC1晚期湖平面上升,主要發(fā)育水下分流河道微相,僅保留上升半旋回的正粒序結(jié)構(gòu)。中期旋回TMSC2初期,受構(gòu)造抬升影響,湖平面下降,砂泥比例減小。中期旋回TMSC3初期,水位較淺,沉積物接近水面,氧化作用比較強(qiáng)烈,形成一套全區(qū)可對(duì)比的炭質(zhì)泥巖標(biāo)志地層,其沉積體系為沼澤濕地,中期旋回TMSC3中后期,構(gòu)造活動(dòng)減弱,湖平面上升,湖泊面積增大,主要發(fā)育濱淺湖沉積微相。采用地質(zhì)、地球物理多科學(xué)融合的方法,“點(diǎn)”“線”“面”“體”逐次深入,于等時(shí)格架中期旋回內(nèi)開展沉積相研究。中期旋回TMSC1時(shí)期,水下分流河道與分流間灣交替發(fā)育,以水下分流河道為主;中期旋回TMSC2時(shí)期,沉積微相與TMSC1時(shí)期相同,但以分流間灣沉積微相為主;中期旋回TMSC3時(shí)期發(fā)育濕地沼澤、淺湖泥微相。哈拉哈塘組砂體(含油砂體)主要發(fā)育于中期旋回TMSC2,多為薄層砂巖(含油砂體)。運(yùn)用地震屬性研究確認(rèn)平均絕對(duì)振幅與中期旋回內(nèi)砂體(儲(chǔ)層)厚度相關(guān)性強(qiáng),能夠揭示旋回內(nèi)砂體展布特征。波阻抗反演剖面不能很好的區(qū)分砂巖和泥巖,SP測(cè)井曲線響應(yīng)特征能夠敏感的區(qū)分砂、泥巖,運(yùn)用擬聲波反演可以很好識(shí)別5m以上的砂體,刻畫砂體的空間展布形態(tài)。綜合旋回界面構(gòu)造解釋成果、地震屬性成果及擬聲波反演成果識(shí)別出12個(gè)圈閉,其中6個(gè)構(gòu)造-巖性圈閉,6個(gè)巖性圈閉。從砂體、蓋層封堵性、含油氣性、與油源的連通方面綜合開展圈閉評(píng)價(jià),優(yōu)選出5個(gè)Ⅰ類圈閉和7個(gè)Ⅱ類圈閉。其中3個(gè)Ⅰ類圈閉鉆獲油層,另2個(gè)Ⅰ類圈閉可作為下一步滾動(dòng)勘探開發(fā)目標(biāo)。
[Abstract]:With the increasing degree of oil and gas exploration in Tahe Oilfield, it is very difficult to find a certain scale of structural trap reservoir again, and the hidden oil and gas reservoir is becoming the main target of attention. The exploration degree of the lithologic traps in the first member of the Triassic is relatively low, so it is of great significance to develop the identification and evaluation of lithologic traps for the rolling development of oil and gas in the later stage. Based on the basic theories of sequence stratigraphy, sedimentology and petroleum geology, according to the characteristics of core, logging and interface, this paper divides the halahatang component into a long term cycle (LSC1) and three intermediate cycles (TMSC1-TMSC3). The lake level rose in the late TMSC1 period of the middle cycle, mainly developed microfacies of underwater distributary channel, and only the normal grain sequence structure of the ascending semi-cycle was retained. In the early stage of TMSC2, the lake level decreases and the ratio of sand to mud decreases due to tectonic uplift. In the early stage of TMSC3, the water level is shallow, the sediment is close to the water surface, and the oxidation is relatively strong, forming a set of comparable carbonaceous mudstone marker strata in the whole area. Its sedimentary system is a swamp wetland, and the tectonic activity is weakened in the middle and late TMSC3 period of the middle cycle. The lake level rises, the lake area increases, mainly develops the shore shallow lake sedimentary microfacies. By using the method of multi-scientific integration of geology and geophysics, the sedimentary facies are studied in the middle cycle of isochronous frame, in which the "point" line, "surface" and "body" are further studied. In the TMSC1 period of the middle cycle, the subaqueous distributary channel and the interdistributary bay developed alternately, and the sedimentary microfacies in the TMSC2 period of the middle cycle were the same as in the TMSC1 period, but the sedimentary microfacies in the interdistributary bay were the main facies. Wetland swamps and shallow lake mud microfacies were developed in the TMSC3 period of the middle cycle. The sand body (oil sand body) of Hala Hattang formation mainly developed in the middle cycle TMSC2, is mainly thin layer sandstone (oil sand body). Using seismic attribute study, it is confirmed that the mean absolute amplitude has strong correlation with the thickness of sand body (reservoir) in the middle cycle, which can reveal the distribution characteristics of sand body in the cycle. Wave impedance inversion profile can not distinguish sandstone from mudstone SP logging curve response characteristics can be sensitive to distinguish sand mudstone the use of pseudo acoustic inversion can be used to identify sand bodies more than 5 m to depict the spatial distribution of sand body shape. In this paper, 12 traps are identified, including 6 tectonic-lithologic traps and 6 lithologic traps. From the aspects of sand body, sealing property of caprock, oil and gas content, connecting with oil source, the trap evaluation is carried out synthetically, and 5 鈪，

本文編號(hào)：2239617