【摘要】：南海南部北康盆地發(fā)育大量的生物礁,蘊(yùn)藏豐富的油氣資源。文章基于北康盆地高精度地震數(shù)據(jù)及鉆井?dāng)?shù)據(jù)的研究表明,北康盆地的生物礁成像較好、類型齊全,有點(diǎn)礁、臺(tái)地邊緣礁、塊狀礁、層狀礁、塔礁、環(huán)礁共6類型。其發(fā)育演化可以分為4個(gè)階段,分別為早中新世的初始發(fā)育階段、中中新世早期的繁盛階段、中中新世晚期的衰退階段和晚中新世的淹沒階段。古近紀(jì)及早中新世的斷裂活動(dòng)產(chǎn)生了大量的構(gòu)造高點(diǎn),為生物礁的初始發(fā)育創(chuàng)造了條件,而中中新世以來基底快速沉降導(dǎo)致的相對(duì)海平面的快速上升決定了生物礁主要發(fā)育于中中新世時(shí)期,而晚中新世以來相對(duì)海平面持續(xù)上升,致使生物礁退積到隆起頂部,從而進(jìn)入淹沒階段。北康盆地的生物礁數(shù)量多、規(guī)模大,而且很少受后期成巖作用的二次改造,具備優(yōu)質(zhì)儲(chǔ)層形成的前提。同時(shí),區(qū)域烴源巖、疏導(dǎo)體系、蓋層及生物礁的分布等油氣地質(zhì)條件,決定了中部隆起西部和東部隆起東部是北康盆地今后生物礁油氣勘探的重點(diǎn)區(qū)域。
[Abstract]:A large number of reefs are developed in the Beikang Basin in the south of the South China Sea, with abundant oil and gas resources. Based on the high precision seismic data and drilling data of Beikang Basin, it is shown that the bioreefs in Beikang Basin have better imaging, complete types and a bit of reefs, and there are 6 types of reef in the platform margin, block reef, layered reef, tower reef and atoll. Its development and evolution can be divided into four stages: the initial development stage of early Miocene, the prosperous stage of early Miocene, the recession stage of late Miocene and the submergence stage of late Miocene. The early Miocene fault activity in Paleogene resulted in a large number of tectonic highs, which created conditions for the initial development of reefs. The rapid rise of the relative sea level caused by the rapid subsidence of the basement since Miocene determined that the reefs mainly developed in the Miocene period, while the relative sea level rose continuously since the late Miocene, which resulted in the reef retreating to the top of the uplift. Thus entering the stage of inundation. The reef in Beikang Basin is abundant in quantity and large in scale, and rarely remade by late diagenesis, so it has the premise of high quality reservoir formation. At the same time, the oil and gas geological conditions, such as regional source rock, dredging system, caprock and reef distribution, determine that the western part of the central uplift and the eastern part of the eastern uplift are the key areas for oil and gas exploration of the reef in Beikang Basin in the future.
【作者單位】： 廣州海洋地質(zhì)調(diào)查局國土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室中國地質(zhì)調(diào)查局海洋石油天然氣地質(zhì)研究中心;
【基金】：國土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室開放基金(KLMMR-2017-A-14) 中國地質(zhì)調(diào)查局項(xiàng)目(DD20160155)聯(lián)合資助~~
【分類號(hào)】：P618.13

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