岩沙

The high porosity zone occurrence of the Tertiary reservoir composed of clastic rocks in the Yuanyanggou region is controlled by diageneses and sedimentary facies, lying in the early diagenetic stage A ~ the late diagenetic stage A1 and the area of the sandstones developing in debouch bar, braided-divided flow channel, raised bank and channel bar is namely high porosity zone development of the lower Shasan Member (Es33) and the upper-middle Shasan Member (Es31-2); furthermore, lying in the late diagenetic stage A2 and the area of the sandstones developing in debouch bar, braided-divided flow channel, raised bank and channel bar is namely high porosity zone comparative development of the lower Shasan Member (Es3) and the upper-middle Shasan Member (Es31-2), the physical property of the reservoir is relatively worse.

鸳鸯沟地区第三系碎屑岩储层高孔带分布受成岩作用和沉积相的控制，处于早成岩阶段A期～晚成岩阶段A_1期，且有河口坝、辫状分流河道、天然堤和心滩沉积微相砂体发育的区域即为该区沙三下亚段和沙三中上亚段储层高孔带的发育区；而处于晚成岩阶段A_2期，且沉积相也为河口坝、辫状分流河道、天然堤和心滩沉积微相砂体发育的区域即为鸳鸯沟地区沙三下亚段和沙三中上亚段储层高孔带的较发育区，储层物性相对较差。

Based on analyses of sedimentary characteristics, it is considered that fan delta is a typical set of retrograding ingression lacustrine sequence.

东营凹陷北部永921 地区沙三段和沙四段广泛发育扇三角洲沉积，从中可以识别出砾岩相、砂岩相、粉砂岩泥岩相和泥岩相等4种岩相类型。

The hydrocarbon source rocks of Fengcheng Formation are mainly distributed in Mahu, West of Well Pen-1, Shawan sags, while the source rocks in Lower Wuerhe Formation are mainly distributed in Mahu, West of Well Pen-1, Shawan, Fukang, Dongdaohaizi, Jimusaer sags.

风城组烃源岩主要分布在玛湖、盆1 井西、沙湾等凹陷，下乌尔禾组烃源岩主要分布在玛湖、盆1 井西、沙湾、阜康、东道海子、吉木萨尔等凹陷。

The organic geochemistry characteristics of source rocks and oil sands in Well Hu 41,Well Hu 83 in Huzhuangji area are studied,by which a preliminary judgement is made that the type of kerogen of Es_3 source rock is a mixed type with high maturity,and its depositional environment is saltness reduction one.

通过对胡状集地区胡41井、胡83井等烃源岩和油砂进行有机地球化学特征研究，可以初步判定胡状集地区沙三段烃源岩干酪根类型为混合型，成熟度较高，沉积环境为咸化的还原环境；沙三段原油属于成熟原油，沙二段原油属于低熟原油；沙三段原油为自生自储原油，沙二段原油与沙三段原油不同源。

Several points can be concluded for the area from this paper study:(1) Hydrocarbon mainly occurs in the lower interval of bioclastic limestone and dolomitic limestone(the special lithologic interval ) in Es_1 Member,in which solution pores well developed;(2) Traps are mainly anticlines controlled by f.

本文研究表明，大中旺地区油气主要分布在沙一段下部的生物碎屑灰岩和云质灰岩段，储层溶蚀孔隙发育；圈闭主要为受断层控制的断背斜构造；原油具有高密度、高粘度、中低凝固点、高初馏点、高含硫量和高胶质沥青质等特点，属于未成熟—低成熟油；油源为本地咸水环境下形成的沙一段暗色泥岩。

The mineralogical and geochemical research on grey-brown laminatedmud stone, oil shale of Shahejie Formation Member 1 of Gulan Subsag found that the content of sapropel was all over 97% and the content of organic matter and chloroform bituments "A" was over 1% and 0.1% respectively in 35 samples. The organic matter belonged to type I and reached the standard of good source rocks.

对孤南洼陷沙一段灰褐色纹层泥岩和油页岩、深灰色油泥岩、深灰色泥岩、灰质泥岩样品进行岩矿及地球化学分析，35块样品的腐泥组含量全部大于97％，表明生烃母质主要为藻类，为Ⅰ型有机质，所有样品的有机碳含量都＞1，氯仿沥青&A&含量＞0.1，全部达到&好烃源岩&标准，是该地区的一套优质烃源岩。

The Es formation was divided into seven third order sequences based on the seismic, drilling and logging data, and plans deposition system plane distribution maps of different time were plotted by dominance phase principle. The lower Es4 is flood-overlake facies mainly; the upper Es4 is meandering stream and braided river delta deposition above the shore shallow lake background; in the Es3 period, the south mainly developed braided river, meandering stream delta, the northeast area main developed meandering stream delta, the middle area mainly developed semi-deep lakean d deep lake sediments. From lower Es3 to upper Es3, the delta scale gradually increased and the depositional area gradually moved to the east and the southeast; the Es2 period was dominated by shore-shallow lake sediments and widely developed braided river delta and delta deposits; the Es1 period was dominated by shore-shallow lake shoal deposits, and in the south developed meandering stream and braided river delta deposits.The lothological traps of the Shahejie group are mainly fluxoturbidite and stratum lateral pinch-out, and its formation and the distribution of the lothological trap were controlled mainly by the basin structure characteristic, palaeogeomorphology and tectonic activity and so on. It had a beneficial geological condition to develope sublacustrine slump turbidite fans in Jishan, Jiangjiadian and Wawu.

利用地震、钻井、测井等资料，将古近系沙河街组划分出7个三级层序，通过剖面沉积学分析，以优势相原则绘制不同时期各亚段沉积体系平面分布图：沙四下总体以洪水-漫湖沉积为特征，沙四上沉积时期是在滨浅湖背景之上发育了曲流河三角洲和辫状河三角洲沉积；沙三段沉积时期南部主要发育辫状河、曲流河三角洲，西北部地区发育曲流河三角洲，中部地区主要为深湖—半深湖沉积；由沙三下至沙三上，西北部三角洲规模逐渐增大，沉积范围逐渐向东、东南方向推进；沙二段沉积时期为滨浅湖沉积，在背景之上广泛发育了辫状河三角洲和三角洲沉积；沙一段以滨浅湖滩坝沉积为特征，南部发育了曲流河三角洲和辫状河三角洲沉积；沉积地层中的岩性圈闭以滑塌浊积岩岩性圈闭和地层侧向尖灭型岩性圈闭为主，其形成和分布主要受盆地结构、沉积古地貌和构造活动强度等因素控制，北部基山、南部江家店和瓦屋具有发育滑塌浊积扇的良好地质条件。

During the preresearch on the testing well location selection in the south of western depression, three kinds of process and research work have been done according to the log datum on Well Moushen:(1)Formation analysis and formation pressure evaluation which verdicts that formation under 5198.5m is not of Trias, whereas is still in Permian, and abnormal formation pressure phenomenon exists in Members 1 and 3-4 of Shahejie Formation;(2)Re-interpretation of oil and gas formation and evaluation of reserve formation;(3)Evaluation of oil source rock. Members 1 and 3-4 source rocks of Shahejie Formation have good capability of oil generation.

在东濮凹陷西洼南部探井选位的前期研究中，根据该井的测井资料情况，做了三方面处理和研究工作：①地层分析和地层压力评价，认为5198.5m以下的地层不是三叠系而仍是下第三系，沙一段和沙三段—沙四段存在高压异常；②重新解释油气层和评价储集层，在沙三段—沙四段发现6层12.87m厚可疑油层；③评价油源岩，认为沙一段和沙三段—沙四段油源岩具有较好的生油能力。

Lithologies are mostly sand and carbonate rocks, caps are mud rock, shale and magmatite. Entrap types are anticline, fault block rebuilt by breaking and the screened entrap diapered rock mass. The composition is CO_2, N_2, CH_4, C_2H_6 and He etc. It is magma air source body and its geologic fashions are intrusion and buried volcanic conduit. The relations between gas reservoirs and gas source bodies have three types: magma intrusion-breaking-communicated gas reservoir, magma intrusion-contacted CO_2 reservoir and buried volcanic conduit-contacted gas reservoir. The CO_2 migration in magma intrusion is consisted of fusing and crystallizing phases;it in volcanic conduit is consisted of near-surface effusion and crystallizing phases.The buoyancy of CO_2 in water far more than migration resistance in breaking or chink, CO_2 is easy float upward, the floating can results in differentiation of different density gases and concentration of sealed gas. The gas in sand reservoir firstly migrate into the higher porosity and coefficient of permeability sand, and along with the pressure going up it migrate into the lower. In magma intrusion-breaking-reservoir migration, CO_2 firstly migrate into watered breaking, began gravity differentiation and concentrate, the gas pressure time and again go up, CO_2 migrate into reservoir and concentrate under expansibility as the pressure reach upward a given extend. The CO_2 in reservoir experience four breaking modes: chemistry deposition, dissolution, diffusion and mechanic breaking, the pressure balance can be broken by faulting and the CO_2 will further migrate and form new reservoir.

济阳坳陷已发现的八里泊、阳25、平方王、平南、高青、花17 CO_2气藏主要储集层位有奥陶系、中生界、沙四段、沙三段、沙一段、馆陶组和明化镇组，储集层岩性以砂岩和碳酸盐岩为主，盖层以泥质岩、页岩和岩浆岩为主。；圈闭类型主要为受断裂改造的背斜、断块及刺穿岩体遮挡圈闭。；气体成分主要有CO_2、N_2、CH_4、C_2H_6、He等。；主要气源体为岩浆气源体，气源体的主要地质形式为侵入体和埋藏的火山通道。；气藏和气源体的空间关系有岩浆侵入体一断裂一气藏沟通型、岩浆侵入体-CO_2气储集层接触型和埋藏火山通道-气储集层接触型三种类型。；岩浆侵入体CO_2气运移分为熔融运移阶段和结晶运移阶段，火山通道中CO_2气运移分成近地表喷发阶段和结晶运移阶段。；断裂中，CO_2在水中的浮力远大于运移阻力，CO_2气容易上浮，CO_2在断裂中的易浮性导致不同密度气体的分异和走向上封闭的断裂气体相对富集。；气体在砂岩储集层运移聚集具有选择性，会优先进入孔隙度和渗透率较高的砂岩，随着压力增加，才会进入孔隙度和渗透率较低的砂岩；在岩浆气源体-断裂-储集层空间输导格架下，CO_2气在膨胀力的驱动下，首先进入含水的断裂并重力分异而聚集，气体压力会不断增高，当压力增至一定程度，CO_2气会向高孔隙度、渗透率的储集层运移并聚集。；在岩浆气源体-储集层接触空间输导格架下，CO_2气受膨胀力的驱动直接向储集层运移并聚集。；成藏的CO_2气会经历化学沉淀、溶解、扩散和机械破坏四种破坏方式，会受断裂切割而打破压力平衡，沿断裂进一步运移和聚集成藏。

The characteristics of sequence development, source reservoir - seal assemblage and types of hydrocarbon reservoir for each sequence were discussed in detail. The dark colored shale of deep lacustrine facies in the transgressive system tract of SⅡ sequence deposited around the maximum flooding surface is the main source rock in this area. The shale of shallow lacustrine facies in the TST of SⅢ sequence around the MFS is the most important regional seal rock.

结果表明，该区古近系可划分为SⅠ，SⅡ，SⅢ和SⅣ4个层序，分别对应于房身泡组、沙三段、沙一段沙二段和东营组。SⅡ层序水进体系域最大湖泛期沉积的半深湖深湖相暗色泥岩是研究区的主力烃源岩系；SⅢ层序水进体系域最大湖泛面附近的浅湖相泥岩是最重要的区域盖层。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。