【摘要】：本文綜合運(yùn)用地質(zhì)、地球物理、地球化學(xué)等資料,研究了前梨園洼陷深層天然氣成因類(lèi)型、來(lái)源,重點(diǎn)解剖了文203-58斷塊區(qū)和杜寨地區(qū)的深層天然氣藏,總結(jié)了前梨園洼陷深層天然氣成藏的主控因素及成藏模式。利用地球化學(xué)資料,分別按母質(zhì)來(lái)源和相態(tài)變化,對(duì)前梨園洼陷深層天然氣進(jìn)行分類(lèi)、判識(shí),結(jié)果表明,深層干氣以晚期干酪根裂解氣為主,含有少量原油裂解氣,分布于洼陷中心;無(wú)油環(huán)凝析氣以干酪根裂解氣和原油裂解氣混合為主,分布于斜坡帶;有油環(huán)的凝析氣為原油裂解氣和原油混合相,主要分布于中央隆起帶等構(gòu)造高部位。從宏觀和微觀兩個(gè)角度研究了深層天然氣的充注路徑,明確了深層天然氣藏主要形成于生烴中心及其鄰近上傾部位。從靜態(tài)地質(zhì)特征、天然氣特征、充注過(guò)程三個(gè)方面解剖典型深層天然氣藏,結(jié)果表明,文203-58斷塊區(qū)油氣充注期分別為東營(yíng)沉積末及明化鎮(zhèn)組沉積期至今,東營(yíng)沉積末期主要充注石油,含有少量原油裂解氣;明化鎮(zhèn)期至今前梨園洼陷再次沉降,溫壓升高,原油大量裂解生氣,并有少量晚期干酪根裂解氣充注于文203-59斷塊圈閉邊緣。杜寨地區(qū)同樣存在兩期油氣充注,東營(yíng)沉積末期,油氣為原油與原油裂解氣和干酪根裂解氣混合相;明化鎮(zhèn)組期,杜寨地區(qū)附近的烴源巖發(fā)生二次生烴,生成晚期干酪根裂解氣充注到圈閉中,并驅(qū)替原有的混合相油氣。通過(guò)綜合研究,前梨園洼陷深層天然氣成藏主控因素可以概括為:烴源巖熱演化及原油裂解控制不同成因類(lèi)型天然氣的生成與分布、微構(gòu)造控制深層天然氣的聚集。前梨園洼陷深層天然氣存在兩種成藏模式:單源早油相晚氣相運(yùn)聚成藏模式和單源早混相晚氣相運(yùn)聚成藏模式,分別發(fā)育于斜坡帶和洼陷帶。前者烴源巖熱演化程度較低,早期生油,晚期生成干酪根裂解氣和原油裂解氣混合的凝析氣,排替古油相,經(jīng)短距離的二次運(yùn)移,在斜坡帶的構(gòu)造-巖性圈閉中成藏;后者烴源巖熱演化程度較高,早期生凝析氣與原油的混相,晚期生干氣,經(jīng)初次運(yùn)移,在洼陷帶的巖性圈閉中就近成藏。
[Abstract]:Based on geological, geophysical and geochemical data, the genetic types and sources of deep natural gas in Qianliyuan sag are studied in this paper, and the deep natural gas reservoirs in Wen20358 fault block area and Duzhai area are dissected. The main controlling factors and reservoir forming model of deep natural gas accumulation in Qianliyuan sag are summarized. Based on the geochemical data, the deep natural gas in Qianliyuan sag is classified and identified according to the source and phase change of parent material, respectively. the results show that the deep dry gas is dominated by late kerogen cracking gas and contains a small amount of crude oil cracking gas. Distributed in the center of the sag; The condensate gas without oil ring is mainly composed of kerogen cracking gas and crude oil cracking gas, which is distributed in the slope zone, and the condensate gas with oil ring is the mixed phase of crude oil cracking gas and crude oil, which is mainly distributed in the high tectonic parts such as the central uplift zone. The filling path of deep natural gas is studied from the macro and micro point of view, and it is clear that the deep natural gas reservoir is mainly formed in the hydrocarbon generation center and its adjacent updip position. The typical deep natural gas reservoirs are dissected from three aspects: static geological characteristics, natural gas characteristics and filling process. The results show that the filling period of oil and gas in the fault block area of Wen 203 / 58 is the sedimentary period at the end of Dongying deposition and Minghuazhen formation, respectively. At the end of Dongying deposition, it was mainly filled with oil and contained a small amount of crude oil cracking gas. From the Minghua town period to the present, the Liyuan sag settled again, the temperature and pressure increased, and a large amount of crude oil cracked gas, and a small amount of late kerogen cracking gas was filled into the trap edge of Wen 203 / 59 fault block. There are also two stages of oil and gas filling in Duzhai area. At the end of Dongying deposition, the oil and gas is a mixture of crude oil and crude oil pyrolysis gas and kerogen cracking gas. During the Minghuazhen formation, the source rocks near Duzhai area produced secondary hydrocarbon generation, formed late kerogen cracking gas and filled into the trap, and displaced the original mixed phase oil and gas. Through comprehensive study, the main controlling factors of deep natural gas accumulation in Qianliyuan sag can be summarized as follows: thermal evolution of source rocks and crude oil cracking control the generation and distribution of different genetic types of natural gas, and microstructure controls the accumulation of deep natural gas. There are two reservoir forming models for deep natural gas in Qianliyuan sag: single source early oil phase late gas migration accumulation model and single source early miscible phase late gas migration accumulation model, which are developed in slope zone and sag zone, respectively. The former source rock has a low degree of thermal evolution, the early generation of oil, the late formation of kerogen cracking gas and crude oil cracking gas mixture condensate gas, the displacement of ancient oil phase, through short distance secondary migration, in the slope zone of the structure-lithologic trap to form a reservoir; The latter source rocks have a high degree of thermal evolution, the mixing of early condensate gas and crude oil, and the late generation of dry gas, after primary migration, are close to the reservoir in the lithologic trap of the sag zone.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13

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