【摘要】：伊通盆地沿北東向縱貫吉林省的中部,位于長春和吉林兩地之間,是吉林省境內(nèi)的狹長斷陷盆地。其地質(zhì)條件復(fù)雜,烴源巖厚度大、質(zhì)量好,儲層發(fā)育,盆地演化后期的擠壓作用使伊通盆地成為富油氣資源盆地,勘探潛力較大。由于伊通盆地西北緣鹿鄉(xiāng)-岔路河斷陷地震資料為90年代末采集,資料品質(zhì)較差,隨著勘探程度的提高,老探區(qū)的資料品質(zhì)不足以滿足現(xiàn)代勘探要求,因此尋找新的分析技術(shù),應(yīng)用新的技術(shù)手段對老探區(qū)資料進(jìn)行重新解釋對伊通盆地能否再次勘探大發(fā)現(xiàn)具有舉足輕重的作用。伊通盆地西北緣鹿鄉(xiāng)-岔路河斷陷構(gòu)造復(fù)雜、地層傾角變化大,地震資料信噪比低,成像質(zhì)量較差,扇體刻畫存在一定的難度。針對以上問題,本文通過應(yīng)用VSP非零偏地震新技術(shù),古地貌分析技術(shù)等,通過地震資料與測井資料相結(jié)合識別構(gòu)造樣式,進(jìn)行扇體刻畫、預(yù)測有利儲層,進(jìn)而研究伊通盆地西北緣鹿鄉(xiāng)-岔路河斷陷成藏條件。研究結(jié)果表明,岔路河斷陷萬昌地區(qū)西北緣受走滑擠壓構(gòu)造應(yīng)力影響,具有較好的成藏構(gòu)造背景,該地區(qū)發(fā)育雙陽組、奢嶺組和永吉組三套烴源巖,處于成熟-高成熟階段,區(qū)內(nèi)普遍發(fā)育萬昌組扇三角洲砂體,埋深較淺,具有較好儲集條件,齊家組泥巖為良好的區(qū)域蓋層、萬昌組二段和萬昌組三段的層內(nèi)泥巖為良好的直接蓋層,多條斷裂溝通了下部烴源巖,可形成下生上儲的巖性-構(gòu)造油氣藏,油藏體現(xiàn)出遠(yuǎn)源、兩期成藏的特點(diǎn);岔路河斷陷西北緣昌40-昌48井區(qū),雙陽組一段為主要烴源巖,烴源巖埋藏較深且烴源巖成熟度達(dá)到成熟-過成熟階段,雙陽組二段發(fā)育大型近岸水下扇,砂巖儲層物性好,是良好的儲集層,雙陽組三段湖進(jìn)形成大套灰黑色泥巖是良好的區(qū)域性蓋層,伸展階段生成的油氣經(jīng)斷層運(yùn)移到雙陽組二段近岸水下扇中,形成斷層-巖性油氣藏,油藏體現(xiàn)出近源、多期成藏的特點(diǎn)。鹿鄉(xiāng)斷陷斷受控藏逆沖斷層限制呈狹長形延伸,烴源巖主要為雙陽組一段和雙陽組三段,奢嶺組一段烴源巖也達(dá)到了生烴門限,烴源巖以腐殖型為主,雙陽組一段底礫巖,雙陽組二段厚層砂巖和奢嶺組一段砂巖為儲層,油氣主要在溝通源巖與儲層的斷裂系統(tǒng)中進(jìn)行運(yùn)移,奢嶺組位于厚層泥巖內(nèi)由于靠近源巖,巖性的側(cè)向變化形成封擋,形成自生自儲的巖性油氣藏;雙陽組近岸水下扇體發(fā)育,規(guī)模大,受埋深影響儲層條件偏差,主要為斷層-巖性油氣藏。在伊通盆地西北緣鹿鄉(xiāng)-岔路河斷陷油氣成藏地質(zhì)條件綜合分析基礎(chǔ)之上,系統(tǒng)總結(jié)鹿鄉(xiāng)-岔路河斷陷油氣分布規(guī)律,認(rèn)為鹿鄉(xiāng)-岔路河斷陷具有含油層系多、油層埋藏深的特點(diǎn),總體呈現(xiàn)油氣縱向疊加連片分布的格局。初步評價(jià)伊通盆地西北緣鹿鄉(xiāng)-岔路河斷陷具有5000萬噸油氣勘探潛力,是伊通盆地下步油氣勘探與開發(fā)的重點(diǎn)區(qū)帶。
[Abstract]:The Yitong basin runs through the middle of Jilin province along the north-east direction and lies between Changchun and Jilin. It is a long and narrow fault basin in Jilin province. The geological conditions are complicated, the source rock is thick, the quality is good, the reservoir is developed, and the compression of the basin in the late stage of evolution makes the Yitong Basin a oil-gas rich basin with great exploration potential. Because the seismic data of Luxiang-Chailuhe fault depression in the northwest margin of Yitong Basin were collected in the late 1990s, the quality of the data is poor. With the improvement of exploration degree, the data quality of the old exploration area is not enough to meet the requirements of modern exploration. It is very important to reinterpret the data of the old exploration area by new technical means for the exploration of Yitong basin. The Luxiang-Chailuhe fault depression in the northwest margin of Yitong basin has complicated structure, large dip angle, low signal-to-noise ratio of seismic data, poor imaging quality, and it is difficult to depict fan body. In view of the above problems, through the application of VSP non-zero bias seismic technique, paleogeomorphology analysis technology and so on, by combining seismic data with logging data to identify the structural style and carry out fan body characterization, the favorable reservoir is predicted. Furthermore, the reservoir forming conditions of Luxiang-Chaluhe fault depression in northwest margin of Yitong Basin are studied. The results show that the northwestern margin of Wanchang area in Chailuhe fault depression is affected by strike-slip compressive tectonic stress and has a good reservoir forming background. There are three sets of hydrocarbon source rocks developed in this area, namely Shuangyang formation, Huiling formation and Yongji formation, which are in the mature-high mature stage. Fan delta sand bodies of Wanchang formation are generally developed in this area, with shallow burial depth and good reservoir conditions. Mudstone of Qijia formation is a good regional caprock, and mudstone of the second member of Wanchang formation and the third member of Wanchang formation are good direct caprocks. Multiple faults communicate the source rock of the lower part, which can form the lithology-structure reservoir of the lower generation and upper reservoir, and the reservoir shows the characteristics of distant source and two-stage reservoir formation. In Chang40-Chang48 well area of northwestern margin of Chailuhe fault depression, the first member of Shuangyang formation is the main source rock. The source rock is buried deep and the maturity of the source rock reaches mature-over-mature stage. The second member of Shuangyang formation has developed large nearshore underwater fan, and the sandstone reservoir has good physical properties. It is a good reservoir, and a large set of gray and black mudstone formed in the third member of Shuangyang formation is a good regional caprock. The oil and gas generated in the extensional stage migrate through the fault to the subsea fan of the second stage of Shuangyang formation, forming a fault-lithologic reservoir. The reservoir shows the characteristics of near source and multi-stage reservoir formation. The limit of controlled reservoir thrust fault in Luxiang fault depression is long and narrow extension. The source rocks are mainly the first member of Shuangyang formation and the third member of Shuangyang formation. The source rocks of the first member of the Yaoling formation also reach the threshold of hydrocarbon generation. The source rocks are mainly humic type and the first member of Shuangyang formation is the bottom conglomerate. The thick sandstone of the second member of Shuangyang formation and the sandstone of the first member of the Qiling formation are reservoirs. Oil and gas are mainly migrated in the fault system between source rock and reservoir. The lateral variation of lithology in the thick mudstone is blocked by the lateral variation of lithology. Forming self-generated and self-stored lithologic reservoirs; The offshore subaqueous fan body of Shuangyang formation has a large scale and is affected by the depth of burying, which is mainly fault-lithologic reservoir. On the basis of comprehensive analysis of oil and gas accumulation geological conditions in Luxiang-Chailuhe fault depression on the northwest margin of Yitong Basin, the distribution of oil and gas in Luxiang-Chailuhe fault depression is systematically summarized. It is considered that Luxiang-Chailuhe fault depression has more oil-bearing strata. Because of the depth of oil reservoir, the oil and gas distribution pattern of vertical superposition and continuous slice is presented in general. The preliminary evaluation of Luxiang-Chailuhe fault depression in the northwest margin of Yitong Basin has a potential of 50 million tons of oil and gas exploration, which is the key zone for oil and gas exploration and development in Yitong Basin.
【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】：2015
【分類號】：P618.13

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