开江—梁平海槽东侧长兴组台缘生物礁发育特征及油气地质勘探意义

doi:10.3969/j.issn.1672-7703.2019.04.006

摘要/Abstract

摘要： 四川盆地开江—梁平海槽东侧已发现普光、黄龙场等大气田，是礁滩重要的勘探领域。为了进一步明确海槽东侧长兴组台缘生物礁发育特征，利用钻井、地震资料，以台缘生物礁外部轮廓、内部形态、平面展布为基础，开展海槽东侧台缘带、台缘生物礁发育特征研究。研究结果表明，开江—梁平海槽东侧台缘依据坡角差异性可划分为陡坡型和缓坡型，平面上具有分段特征，且发育缓坡退积型和陡坡叠加型两种模式，以缓坡退积型为主；台缘生物礁发育主要受海平面变化、同沉积多级断裂及区域拉张共同作用；缓坡台缘生物礁发育经历微古地貌形成期（吴家坪晚期）、缓坡滩发育期（长一期）、弱镶边台缘礁滩发育期（长二早期）、镶边台缘多排礁滩发育期（长二中期—长三期）4 个演化阶段。开江—梁平海槽东侧长兴组缓坡多排礁分布面积广，油气成藏条件优越，是天然气勘探值得关注的重要领域。

关键词: 开江&mdash, 梁平海槽；台缘生物礁；缓坡型台缘；发育模式；生物礁演化阶段

Abstract: Several giant gas fields (Puguang, Huanglongchang, etc.) have been found in eastern Kaijiang-Liangping ocean trough, Sichuan Basin, which is an important exploration domain of reef beach. In order to further clarify the development characteristics of platform margin reefs in the Changxing Formation in the eastern side of the ocean trough, based on drilling and seismic data, the development characteristics of platform margin belt and platform margin reefs on the eastern side of the trough were studied on the basis of the external outline, internal shape and plane distribution of platform margin reefs. The study results indicate: (1) According to slope angle difference, the platform margin in the eastern Kaijiang-Liangping ocean trough can be divided into steep slope type and gentle slope type. (2) It has sectional feature on plane. (3) There are two development patterns (retrogradation pattern in gentle slope, superposition pattern in steep slope), and the retrogradation pattern in gentle slope is the dominant. (4) The development of platform margin reefs is mainly controlled by sea level change, multiple-level synsedimentary faults and regional tension. (5) The reef development on the gentle slope platform margin experienced four evolution stages: micro-palaeogeomorphic formation stage (Wujiaping), gentle slope beach development stage (Chang 1 stage), weak rimmed platform margin reef beach development stage (early Chang 2 stage), multi-row reef beach development stage on rimmed platform margin (middle Chang 2-Chang 3 stage). The multi-row reefs in the gentle slope of the Changxing Formation in the eastern Kaijiang-Liangping ocean trough have wide distribution area and favorable hydrocarbon accumulation conditions. It is an important area for natural gas exploration.

中图分类号:

武赛军, 魏国齐, 杨威, 段书府, 金惠, 谢武仁, 王明磊, 王坤, 苏楠, 马石玉, 郝翠果, 王小丹. 开江—梁平海槽东侧长兴组台缘生物礁发育特征及油气地质勘探意义[J]. 中国石油勘探, 2019, 24(4): 457-465.

Wu Saijun, Wei Guoqi, Yang Wei, Duan Shufu, Jin Hui, Xie Wuren, Wang Minglei, Wang Kun, Su Nan, Ma Shiyu, Hao Cuiguo, Wang Xiaodan. Development characteristics of reefs on the platform margin of Changxing Formation in eastern Kaijiang-Liangping ocean trough and its significance for petroleum geological exploration[J]. China Petroleum Exploration, 2019, 24(4): 457-465.

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