江苏高邮凹陷古近系戴南组一段物源体系和沉积相

对碎屑组分和重矿物的分析结果表明,高邮凹陷戴南组一段沉积时期,北部斜坡带的花庄、富民 北部和永安地区沉积物来自柘垛低凸起方向,联盟庄和马家嘴地区沉积物来自菱塘桥低凸起方向;南部陡坡带 沉积物来自通扬隆起,周庄地区沉积物来自东部物源区。戴一段沉积物母岩岩性以中-低级变质岩为主,中酸 性火山岩的分布较基性火山岩要广,深成岩较少或没有。根据岩心观察、录测井资料分析,及研究区物源体系 特征,认为高邮凹陷戴南组一段沉积时期,发育扇三角洲、三角洲、近岸水下扇和湖泊沉积。凹陷北部斜坡带 地形坡度较缓,来自柘垛低凸起和菱塘桥低凸起方向的沉积物呈点物源形式沿水下河道在缓坡带形成三角洲沉 积,物源供给量的差异导致三角洲朵体大小不同;凹陷南部陡坡带地形高差较大,在湖岸临近高地发育多条水 下河道,沉积物被剥蚀后呈多物源形式就近入湖沉积,加之母岩类型差异,在湖盆陡坡带形成近岸水下扇、扇 三角洲沉积体;凹陷西南部因汉留断层的存在造成三角洲前缘与前三角洲的高差,使原沉积的三角洲前缘沉积 物发生滑塌,并以线状物源形式在较深水处形成滑塌浊积扇;凹陷中部和砂岩及砂砾岩沉积体的侧翼和远端受 构造活动影响较小,物源供给不充分,发育湖泊相沉积。     

吐哈盆地台南凹陷二叠系充填特征及其研究意义

以高分辨率层序地层学为指导,结合台南凹陷幕式构造演化特征,利用岩心观察、试油数据、地球物理及化学数据等,对台南凹陷二叠系进行了层序地层分析。研究表明研究区二叠系层序地层充填特征、烃源岩和储层分布受控于幕式构造演化,具有明显阶段性。断陷盆地结构特征控制着岩性叠加样式和沉积展布：LSC1沉积时期,南部觉罗塔格山脉崛起,北部陡坡带发育扇三角洲和水底扇沉积,南部缓坡带发育辫状河三角洲沉积体系;LSC2沉积时期,西部鲁西凸起和东部塔克泉凸起逐渐形成,南部物源减弱,东西物源逐渐占主导地位;LSC3沉积时期,北部博格达山脉崛起,地层南北向掀斜,北部物源逐渐发育,断陷短轴方向以扇三角洲沉积体系为主,长轴方向以扇三角洲沉积-辫状河三角洲沉积-湖泊沉积逐渐过渡。分析台南凹陷层序地层叠加样式对烃源岩和储层的控制作用后认为：LSC2水进体系域晚期和高水位体系域早期发育的大段泥岩为有利烃源岩,其上部LSC3低水位体系域发育的大套砂岩为油气主要储集层段。     

珠江口盆地惠州凹陷古近纪多幕裂陷旋回的沉积物源响应

为阐明惠州凹陷古近纪构造活动对物源供给与沉积充填的控制作用,以LA-ICPMS锆石U-Pb定年为主要技术手段,对惠州凹陷古近系不同层段的8件样品中的锆石形态及年代组成进行分析,定量研究其物源供给规律.南部物源,即盆内基岩凸起与东沙隆起,以中生代火成岩为主;北部物源,即盆外华南褶皱带,岩性及年代学复杂.结果显示从下文昌组-上文昌组-恩平组的砂岩样品中,中生代锆石颗粒含量逐渐降低,前寒武-古生代锆石颗粒含量逐渐增加,表明惠州凹陷具有早期南部供源逐渐到晚期北部供源的转换规律.惠州凹陷构造演化分为3幕:裂陷Ⅰ_A、Ⅰ_B和Ⅱ幕.裂陷Ⅰ_A幕,下文昌组沉积时期,凹陷南部断层活动强烈,砂岩中锆石以中生代颗粒为主,沉积相类型以靠近南部断裂带发育的扇三角洲及中深湖相为主;裂陷Ⅰ_B幕,上文昌组沉积时期,北部边界断裂带活动强度增加,中生代锆石颗粒含量为68%,前寒武-古生代颗粒含量为32%,表明该时期南北同时供源,沉积体系以扇三角洲、辫状河三角洲及中深湖相为特色;裂陷Ⅱ幕,恩平组沉积时期,北部断层持续活动,前寒武-古生代锆石颗粒含量为64%,中生代颗粒含量为36%,证实恩平组沉积时期以北部物源为主,发育了浅水辫状河三角洲、滩坝以及薄煤层.      

北黄海盆地东部坳陷侏罗纪北部物源--沉积体系的岩矿特征

以北黄海盆地东部坳陷北部侏罗系为目的层,探讨侏罗纪北部物源-沉积体系的岩矿特征、物源区构造背景和物源方向。研究区侏罗系是一套陆相碎屑岩沉积,主要岩石类型为岩屑石英砂岩和岩屑砂岩。通过对北黄海盆地东部坳陷侏罗系沉积序列的研究,识别出三角洲、扇三角洲和湖泊等3类沉积环境。根据碎屑组分和灰岩丰度可知,北部物源-沉积体系为风化物源,并存在附加的火山物源,物源区为再旋回造山带,沉积体系为自北向南方向的扇三角洲沉积体系。对岩石样品进行微观特征及粒度特征研究,识别出沉积微相类型有扇三角洲前缘亚相的远砂坝、河口坝、水下河道和重力水下河道4种微相。     

白云凹陷恩平组沉积晚期大型三角洲发育特征及其意义

白云凹陷恩平组沉积晚期发育大型的辫状河三角洲,但该三角洲的沉积过程、内部发育期次及平面分布规律尚不明确.基于9口钻遇恩三段的钻井资料,开展了砂岩碎屑锆石U-Pb定年及全区覆盖的三维、二维地震资料分析.结果表明恩平组不同沉积时期的主要物源供给方式:恩平组早-中期以白云凹陷四周隆起提供短程物源碎屑为主(母岩类型以中生代火成岩为主),恩平组沉积晚期白云凹陷与北部珠一坳陷开始连通,盆外大型水系携带华南褶皱带物源碎屑沿NW-SE方向进入白云凹陷沉积(母岩类型以古生代-前寒武系变质岩为主),大型三角洲开始发育.地震相及能量半衰时属性分析揭示了白云凹陷恩平组沉积晚期大型三角洲的沉积构成特征,即发育3期不断向东南方向进积的楔状体,其沉积规模由小到大,然后再变小,直至断陷消亡.恩平组沉积晚期三角洲煤系烃源岩及陆源海相烃源岩广泛发育,大型三角洲具备优越的生储盖组合,有利于形成三角洲前缘上倾尖灭油气藏,是白云凹陷深水区古近系油气勘探重要目标.      

东营凹陷青南地区沙四上亚段物源沉积体系与滩坝分布

滩坝砂岩是近年来东营凹陷沙四上亚段油气勘探活跃且成效显著的一类隐蔽岩性地层油气藏,但在青南地区,由于缺乏对物源沉积体系的系统研究,对滩坝的分布范围和规模认识不足,制约了该区的精细勘探和储量升级。通过砂岩重矿物组合和泥岩特征元素比值分布模式的综合物源分析认为,北部物源主要供应方向为西南方向,南部物源主要供应方向为西北方向和正北方向,且南部物源影响范围显著大于北部物源,并将南北物源的混合区域限定在X7井-Wx583井-W58井-W126井-L74井-Wx119井-L108井-L2井-L64井-Lx63井连线一带;通过岩石学和测井研究在研究区划分出冲积扇、三角洲、湖泊、重力流4种沉积体系和近岸水下扇、扇三角洲、河流三角洲、湖泊和深水浊积扇5种沉积相类型;通过物源控制下的沉积相连井对比和不同砂组时期沉积相的平面分布研究,厘清了物源沉积体系的演化特征和各类砂体,特别是滩坝的分布范围和规模,为油田的精细勘探提供依据。青南地区沙四上亚段滩坝主要来自南部物源,其发育规模仅次于河流三角洲,发育层位遍及整个沙四上亚段,单个砂组的发育规模受同时期河流三角洲发育规模的影响较大,受扇三角洲发育规模的影响较小:河流三角洲发育规模较大但扇三角洲不发育的纯下3砂组-纯上4砂组时期,滩坝发育规模较大;河流三角洲发育规模逐渐缩小但扇三角洲发育规模逐渐增大的纯上3砂组-纯上1砂组时期,滩坝发育规模也逐渐减小。     

准噶尔盆地莫西庄—永进地区白垩系清水河组地貌演化及沉积响应

不同古地貌背景下,盆地沉积充填特征不同。以准噶尔盆地莫西庄—永进地区白垩系清水河组为例,综合野外露头、岩心、测井、分析化验和三维地震资料,进行古地貌演化背景下白垩系清水河组层序地层、沉积物源和沉积体系研究。研究结果表明:莫西庄—永进地区白垩系清水河组发育一个完整的三级层序,清水河组一段发育低位体系域(LST)和湖侵体系域(TST),清水河组二段发育高位体系域(HST)。早白垩世,车排子—莫索湾古隆起(车—莫古隆起)整体埋藏,古隆起局部高部位仍出露地表,随着盆地全区接受稳定沉积,古隆起逐渐消亡。LST时期,盆地沉积中心位于研究区北部;TST至HST时期,在北部构造抬升掀斜作用下,盆地地形趋于平缓,沉积中心逐渐南迁。在此构造演化背景下,盆外北部物源体系由东北、西北方向向研究区供源,在盆地缓坡带浅水背景下发育远源辫状河三角洲—滨浅湖沉积体系。LST时期,受古隆起残余地貌、湖平面变化及水动力条件的共同影响,沉积碎屑多沉积于地貌低势区,发育局限展布的浅水辫状河三角洲,研究区以三角洲内前缘沉积为主,水下分流河道连片发育;LST时期发育的沉积体系平缓了原始地貌,在车—莫古隆起上继承性沉积TST时期的滨浅湖沉积体系和HST时期的浅水辫状河三角洲沉积体系,其中HST时期研究区以三角洲外前缘沉积为主,广泛发育席状砂,局部发育水下分流河道。继承性地貌控制盆地不同部位的沉积可容空间,决定沉积物搬运及分散路径,进而控制盆地的沉积充填类型和特征。     

库车坳陷西段北部单斜带早中侏罗世沉积相特征及其与铀成矿关系

库车坳陷西段北部单斜带为向南倾的构造单斜带,早中侏罗世沉积了一套河-湖碎屑沉积体。下侏罗统塔里奇克组、阿合组、阳霞组和中侏罗统克孜勒努尔组为灰色含煤岩系,是砂岩型铀成矿有利层位。通过实测剖面、钻孔分析,识别出5类沉积相:辫状河、辫状河三角洲、曲流河三角洲、沼泽、湖。辫状河三角洲、曲流河三角洲砂体发育,隔水层稳定,泥-砂-泥结构好,为砂岩型铀成矿有利相带;辫状河隔水层不发育,泥-砂-泥结构差,不利于砂岩型铀成矿;沼泽、湖砂体不发育,不利于砂岩型铀成矿。     

鄂尔多斯盆地及周缘地区上二叠统沉积特征

基于野外地质露头观察、岩心描述、薄片鉴定和地球化学等分析测试资料的综合分析,对鄂尔多斯盆地及周缘地区上二叠统石千峰组沉积岩石类型、沉积构造、沉积相类型及沉积体系空间展布等方面开展研究。结果表明,石千峰组主要发育冲积平原、三角洲平原、三角洲前缘、浅湖和南部海陆过渡的潟湖、沙坝等沉积环境,石千峰期,古气候干燥炎热,沉积古地形相对平缓,物源供给充足,形成了一套紫红色、棕红色泥岩和浅灰色中粗粒长石岩屑砂岩、岩屑长石砂岩、长石砂岩为主的地层。盆地北部三角洲规模大,以辫状河道发育沉积特征为主,砂体厚度大、横向分布稳定,而盆地南部三角洲规模相对较小。石千峰期,海水可能多次入侵盆地南部麟游-韩城-乡宁一带,发育海相夹层和沙坝沉积,一定程度上影响了南部的沉积环境和砂体展布。     

北三台地区北83井二叠系梧桐沟组沉积物源分析

为了弄清准噶尔盆地北三台凸起南斜坡带北83井区二叠系梧桐沟组物源与其沉积体系展布特征,对研究区地层厚度、砂岩碎屑组分组成特征、重矿物组合及ZTR指数以及粒度分布特征等方面的资料进行了分析,分析结果显示出母岩区类型以火成岩为主,存在南部、北部两个方向的主要物源。在南部物源的控制下,发育有辫状河三角洲前缘沉积,而在北部物源的影响下,工区北部发育湖底扇沉积。通过对工区梧桐沟组沉积物来源、沉积特征、砂砾岩百分含量等值线、泥岩百分含量等值线、沉积相划分、储层物性统计分析,可知油气分布基本上受控于沉积相,主要为岩性油气藏。     

珠江口盆地恩平21洼文昌组沉积期原型盆地及其对优质烃源岩的控制

珠江口盆地阳江东凹恩平21洼古近纪文昌组沉积期发育断陷湖盆,由于该区古近纪经历多期岩浆底辟和整体构造抬升,导致原型盆地被强烈改造,使其主要生烃层段文昌组的原型盆地面貌不清,从而给油气勘探和资源潜力评价造成困难。本文遵循改造型盆地的研究思路,将地震解析、声波时差法和趋势厚度法相结合,恢复了文昌组沉积期洼陷的原始面貌,并明确了优质烃源岩的展布范围。研究表明,阳江东凹恩平21洼在始新世文昌组沉积末期遭受强烈的剥蚀改造,造成洼陷东北部1/4沉积地层剥蚀殆尽;在文二段沉积期,恩平21洼北部与恩平14洼连通形成广盆深水的沉积环境,控制文二段半深湖相优质烃源岩的形成。从文昌组烃源岩的原始沉积规模和勘探实践来看,阳江凹陷具有良好的资源潜力。     

陆丰南地区断拗转换界面厘定及其地质意义

珠江口盆地经历裂陷阶段向拗陷阶段的转变，同期沉积地层记录了该构造变革和沉积演化过程，为厘定断拗转换界面提供了可能。基于地震反射、沉积旋回特征，识别出陆丰南地区恩平组内部存在全区可追踪对比的构造沉积转换面——T72界面，也是区分上下恩平组界面。对陆丰13洼洼间隆钻井LFA开展上下恩平组碎屑锆石U- Pb 定年、重矿物组分、元素分析，提出恩平组T72界面上下地层物源体系发生转变。结合区域沉积充填特征，表明陆丰南地区T72界面为断- 拗转换界面。具体表现为：下恩平组沉积期湖盆继承文昌期裂陷盆地特征，湖盆水体较深，物源主要为盆地内部的中生代基底凸起，沉积层序明显受盆内低凸起控制，在盆内低凸起四周发育一系列近源的辫状河三角洲，井区主要接受来自惠陆低凸起物源;上恩平组沉积期间，湖盆进入断拗过渡期，湖盆扩大、水体变浅，盆内低凸起四周的断裂活动减弱，沉积层序逐渐向盆内低凸起超覆，盆外太古宙—古生代物源组分供给不断加强，近源的三角洲砂体逐渐向远源的浅水三角洲砂体转化，同时发育宽广的滨浅湖环境，原供给物源的惠陆低凸起为水体淹没，井区接受了北部隆起外的物源。     

Geochemical characteristics and analysis of crude-oil source in the deep-water area of the Baiyun Sag,South China Sea

In the Baiyun Sag, the oil relationship with possible source rocks is complicated, and little research on oil sources in the area has been performed. In this paper, geochemical studies of carbon isotopes, biomarkers, paleoenvironmental deposition, and crude oil maturity, carried out with the use of oil samples from the Baiyun Sag, demonstrate that the organic matter in crude oil has an oxidizing depositional environment and primarily lacustrine facies conditions, with a significantly higher plant input. The oil samples used are mature to highly mature. Crude oil in the northern area of the Baiyun Sag is more mature than samples in the eastern part of the sag. Despite limited source rock data, we were able to conclude that the crude oil samples were derived mainly from the Enping Formation; other potential source rocks of the Wenchang and Zhuhai Formations may also have contributed to the reservoirs in different parts of the sag. Furthermore, the source of crude oil in each structure in the Baiyun Sag was analyzed; for example, crude oil in the LH19-5 structure was generated from the organic matter of the Enping Formation, and crude oil in the LW3-1 structure was derived from the mixed organic matter of the Enping, Wenchang, and Zhuhai Formations. © 2018, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.     

From Cadomian arc to Ordovician passive margin: geochemical records preserved in metasedimentary successions of the Orlica-Śnieżnik Dome in SW Poland

The chemical composition of metamorphosed siliciclastic rocks in the Orlica-?nie?nik Dome (Bohemian Massif) identifies the main sources for the Neoproterozoic [the M?ynowiec Formation (MF)], Early Cambrian [the Stronie Formation (SF)] and Late Cambrian/Early Ordovician [the Goszów quartzites (GQ)] sediments. The MF developed from erosion of a Cadomian magmatic arc along the northern Gondwana margin. The variegated SF, with supra-subduction affinities, shows chemical characteristics pointing to erosion of the freshly exhumed Cadomian orogen and detritus deposition in the back-arc basin. The very different chemical features of the GQ indicate deposition in a basin sited on a passive continental margin. The explanation proposed for the observed changes in chemical composition involves three main stages: (1) The pre ~540 Ma evolution of an active continental margin and related back-arc basin ceased with the collision and accretion of the magmatic arc to the Gondwana margin; (2) Early Cambrian rift to drift transition (540–500 Ma) and development of a depositional basin filled with detritus derived from remnants of the magmatic arc; (3) Peri-Gondwana break-up leading to the formation of shallow-water passive margin depositional basins filled with quartz-rich detritus resembling Early Ordovician Armorican quartzites known from other parts of the Variscan Belt.     

珠江口盆地恩平凹陷恩平组物源体系分析及未来大洋钻探建议

物源体系分析是沉积盆地特征分析的重要内容，为进一步阐明珠江口盆地恩平凹陷恩平组的沉积特征和物源体系，本文拟利用恩平凹陷的三维地震资料和钻井数据，通过古生物环境分析和锆石U- Pb定年等方法，并借助地震剖面中古沟谷的识别、前积反射结构、地震多属性分析结果和沉积相带平面分布特征，对恩平凹陷恩平组物源体系特征进行综合分析。研究结果表明，恩平组PSQ1～PSQ2时期表现位明显的陆相湖盆特征，物源主要为珠江口盆地内隆起的古生代变质岩和中生代火成岩基底，少量来源于北部华南褶皱带的元古宙变质岩；随着PSQ3时期断层活动逐渐停止，湖平面不断上升，华南褶皱带物源供给能力明显增强，逐渐成为恩平凹陷主要物源。鉴于目前南海北部缺少陆相湖盆地层的完整岩芯剖面，制约了南海北部裂陷期构造- 沉积耦合研究并影响了该地区的油气勘探，建议下一步在南海北部陆相沉积盆地(如珠江口盆地)开展大洋钻探工作，以便获取更连续、时间精度更高，受风化作用影响更小的陆相湖盆地层的完整岩芯剖面。这不仅有利于指导下一步油气勘探，也可通过重建陆相沉积盆地不同地质历史时期的沉积变化过程，为了解古气候状态和预测未来气候变化提供重要依据。     

南海北部陆缘大陆架科学钻探选址：珠江口盆地沉积源汇启示

南海海盆自1998年始开展了一系列大洋科学钻探，取得了重大成就，但揭开南海海盆打开过程的关键记录在南海北部陆缘大陆架。因此，开展南海北部陆缘科学钻探非常必要。珠一坳陷位于南海北部珠江口盆地，不仅具有巨大的油气资源潜力，而且记录了南海海盆打开前的地质背景。该地区的物源特征分析对于揭示物质源汇过程、重建盆地构造演化过程、预测优质储层具有重要指示作用，一直是当前研究的热点，也可从沉积学角度为论证南海大陆架科学钻探选址提供依据。本文采用锆石LA- ICP- MS U- Pb定年技术，结合锆石CL图像及稀土元素配分特征，对珠一坳陷东西两侧典型地区的样品锆石进行了物源示踪、沉积源汇分析，并探讨其物源变化的构造成因。结果表明，下始新统下文昌组沉积期到上始新统上文昌组- 下恩平组沉积期，坳陷物源由盆内转换为盆外供应为主。其中，恩平凹陷部分洼陷由于没有文昌组沉积地层，下恩平组仍以盆地内物源供给为主；惠州凹陷和陆丰凹陷则从上文昌组开始转为盆外物源供给。惠州和陆丰地区上始新统恩平组、渐新统珠海组、下中新统珠江组地层锆石自形程度较低，磨圆度较高，边缘破坏较为严重，年龄分布较为分散，稀土元素配分特征与基底不同，说明上文昌组- 恩平组地层沉积之后，坳陷主要接受盆外华南板块物源供给。该物源转换与~43 Ma时珠一坳陷裂陷作用自南向北的转换密切相关。     

Evolution and strike variability of early post-rift deep-marine depositional systems: Lower to Mid-Cretaceous, North Viking Graben, Norwegian North Sea

The controls and development of early-post-rift, deep-water depositional systems are poorly understood due to their commonly deeply-buried nature. As a consequence, in the subsurface there is usually a lack of well penetrations and/or weak seismic imaging. At outcrop, early post-rift strata have commonly been deformed beyond reasonable recognition by later inversion tectonics. In contrast to these systems, the North Viking Graben shows a well-imaged Cretaceous early post-rift package with good well control and little effect from inversion. Therefore, this paper examines the early post-rift, deep-water depositional systems of the North Viking Graben to determine the controls on their stratigraphic position, geometry and evolution, and thus provide an analogue for comparable systems. Greater understanding of such systems will allow for the enhanced prediction of reservoir units in the subsurface and development of new play models since post-rift intervals are generally under-explored.The basin configuration inherited by the Cretaceous early post-rift in the northern North Sea was set up by Permo-Triassic and Late Jurassic rifting. In the North Viking Graben this established considerable along-strike variability, resulting in a northern basin segment surrounded by steep slopes and faulted-bounded structural highs and a southern basin segment margined by slopes with noticeably gentler gradients. Associated with the Cretaceous post-rift is an overall transgressional trend, which drowned local source areas, resulting in prevalent carbonate and hemipelagic mudstone deposition in the basins. In the North Viking Graben, the uplifted Oseberg fault-block provided the sub-aerial clastic source area until it was submerged in the early Upper Cretaceous.The early post-rift infill of the North Viking Graben was divided into four key seismic stratigraphic units (K1, K2, K3 and K4) using an integration of seismic and well data. Inside this stratigraphic framework, the depositional systems within each K-unit were resolved from characteristic seismic facies, amplitude anomalies, relationship with adjacent reflections, and geomorphologies. In the northern basin segment, the early post-rift stratigraphy contains basin-floor fans, a channel complex and a shoreline-like geometry, whereas the southern basin segment is solely characterised by hemipelagic and carbonate deposition. This spatial variability indicates that one of the dominant controls on the development of the early post-rift depositional systems in the North Viking Graben was the inherited syn-rift fault-controlled topography. The steep slopes bounding the northern basin segment aided the delivery of sediment from the sub-aerial Oseberg source area to the graben whereas the submerged, gentle slopes in the southern basin segment were relatively sediment-starved.Long- and short-term changes in relative sea-level also heavily influenced the evolution of the early post-rift basin stratigraphy. Short-term relative sea-level fall allowed basin-floor fan emplacement whereas short-term relative sea-level stand-still favoured deposition of a channel complex. Deposition of the shoreface-like geometry is associated with a short-term relative sea-level rise. This temporal difference in the style and scale of the depositional systems is also interpreted to reflect the gradual denudation and drowning of the Oseberg source area. Regional short-term trangressive and anoxic events in the northern North Sea further influenced the early post-rift strata, resulting in the deposition of stratigraphic units that can be correlated across the North Sea.     

Strike-slip tectonics within the SW Baltic Sea and its relationship to the inversion of the Mid-Polish Trough—evidence from high-resolution seismic data

The SW Baltic Sea occupies an area where crustal-scale regional tectonic zones of different age merge and overlap, creating a complex tectonic pattern. This pattern influenced the evolution of the Mesozoic sedimentary basin in this area. We present an interpretation of new high-resolution seismic data from the SW Baltic Sea which provided new information both on modes of the Late Cretaceous inversion of this part of the Danish–Polish Mesozoic basin system as well as on relationship between tectonic processes and syn-tectonic depositional systems. Within the Bornholm–Dar owo Fault Zone, located between the Koszalin Fault and Christiansø Block, both strike-slip and reverse faulting took place during the inversion-related activity. The faulting was related to reactivation of extensional pre-Permian fault system. Syn-tectonic sedimentary features include a prominent, generally S- and SE-directed, progradational depositional system with the major source area provided by uplifted basement blocks, in particular by the Bornholm Block. Sediment progradation was enhanced by downfaulting along a strike-slip fault zone and related expansion of accommodation space. Closer to the Christiansø Block, some syn-tectonic deposition also took place and resulted in subtle thickness changes within the hinge zones of inversion-related growth folds. Lack of significant sediment supply from the inverted and uplifted offshore part of the Mid-Polish Trough suggests that in this area NW–SE-located marginal trough parallel to the inversion axis of the Mid-Polish Trough did not form, and that uplifted Bornholm Block played by far more prominent role for development of syn-inversion depositional successions.