川东飞仙关组鲕粒滩岩性识别及其分布特征  

Lithology and Distribution Characteristics of the Oolitic Beach from the Feixianguan Formation,Eastern Sichuan Basin

作　　者：叶榆 程超[1] 蒋裕强[1] 易娟子 邓虹兵 李曦 谷一凡 陈雁[5] YE Yu;CHENG Chao;JIANG YuQiang;YI JuanZi;DENG HongBing;LI Xi;GU YiFan;CHEN Yan(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;Chongqing Gas Mine,PetroChina Southwest Oil and Gas Field Company,Chongqing 400021,China;The Second Gas Production Plant of SINOPEC Southwest Oil&Gas Company,Langzhong,Sichuan 637400,China;The Third Gas Production Plant of SINOPEC Southwest Oil&Gas Company,Deyang,Sichuan 618100,China;School of Computer Science and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石油西南油气田公司重庆气矿,重庆400021 [3]中国石化西南油气分公司采气二厂,四川阆中637400 [4]中国石化西南油气分公司采气三厂,四川德阳618100 [5]西南石油大学计算机科学与技术学院,成都610500

出　　处：《沉积学报》2024年第3期1032-1046,共15页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(41430316);国家科技重大专项(2017ZX05008-004-008)。

摘　　要：【目的】为解决针对川东海槽南段西侧、台内等地区飞仙关组岩性变化不明确等问题。【方法】综合利用岩心、薄片、钻录井等多元地质数据对飞仙关组岩性类型及特征进行研究,提出以机器学习为基础的岩性测井智能识别方法,解决了老区岩性精细识别的技术难题,揭示了区内飞仙关组鲕粒滩岩性、分布及演化规律。【结论与结果】(1)飞仙关组主要由泥岩、泥晶灰岩、泥质灰岩、鲕粒灰岩、鲕粒云岩、泥晶云岩、膏质云岩、膏岩等岩性组成;(2)对比发现,改进的梯度提升决策树算法即随机梯度提升决策树(SGBDT)构建岩性模型优于其他算法,更适合碳酸盐岩复杂岩性识别;(3)鲕粒灰岩集中发育于开江—梁平海槽以南地区的飞一段—飞三段时期,鲕粒云岩集中发育于飞二段时期且分布分散;(4)区内鲕粒滩分布差异明显,飞一段时期主要发育于台地古地貌高点和台地边缘,飞二段时期多发育台缘鲕粒滩,少量发育台内古地貌高点鲕滩和点滩,飞三段时期主要发育台内点滩。[Objective]To solve the problems such as unclear lithological variations of the Feixianguan Formation on the western side of the marine trough's southern segment and within the plateau interior of the eastern part of the Sichuan Basin,[Methods]the lithological types and characteristics of the Feixianguan Formation were studied by comprehensively using multiple geological data such as cores,drilling and logging,and an intelligent identification method of lithological logging based on machine learning was proposed,which solved the technical problems of fine identification of lithology in the old area,and revealed the lithology,distribution and evolution of the Feixianguan Formation in the area.[Results and Conclusions](1)The Feixianguan Formation is mainly composed of lithology such as mudstone,mud crystal limestone,argillary limestone,granule limestone,granulous dolomite,mud crystal dolomite,paste dolomite,and gypsum rock;(2)Comparison found that the improved gradient-boosted decision tree algorithm,namely Stochastic Gradient Boosting Decision Tree(SGBDT),is superior to other algorithms for constructing lithology models,and is more suitable for carbonate rock complex lithology identification;(3)The granule limestone developed intensively in the area south of the Kaijiang-Liangping Sea Trough between Feixianguan I period and FeixianguanⅢperiod,and the granulous dolomite was concentrated in the FeixianguanⅡperiod and distributed and scattered;(4)The distribution of the oolitic shoal in the area exhibits significant variation.The main development of the plateau ancient geomorphological high point and the edge of the platform in the Feixianguan I period.In the FeixianguanⅡperiod,most of the the oolitic shoal at the edge of the platform were developed,and a small number of ancient landforms in the platform were developed.And the main development of the plateau ancient geomorphological high point in the FeixianguanⅢperiod.

关 键 词：SGBDT算法 岩性识别 沉积演化 鲕粒滩分布特征 飞仙关组 川东 

分 类 号：P618.13[天文地球—矿床学]